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{"id":4117940240486,"title":"Ultraspire Zygos 4.0 Hydration Pack | 2L BPA \u0026 PVC Free Reservoir with Mag-Clip","handle":"ultraspire-zygos-4-0-hydration-pack-2l-bpa-pvc-free-reservoir-with-mag-clip","description":"Bryce Thatcher’s pack of choice, the Zygos 4.0 hydration pack is very versatile. This pack is lightweight and high capacity, a comfortable wrap around style with full compression allow for the lowest profile empty or fully loaded. The Zygos 4.0 comes with a 2L reservoir and a magnetic clip to keep your hands free. Whether you are fastpacking, mountain biking, in a fast race, ultra-race, or a summit assaults this hydration backpack is the solution for any athlete. Now available in five sizes.\u003cbr\u003e\n\u003cbr\u003e\nDetails\u003cbr\u003e\n\u003cbr\u003e\n• Lightweight, soft, breathable, but strong, large-holed mesh pulls moisture away from the body to keep skin dry and cool.\u003cbr\u003e\n\u003cbr\u003e\n• Silicone and PU coated feather-weight nylon fabrics resist water, abrasion and tears.\u003cbr\u003e\n\u003cbr\u003e\n• Max O2 Sternum for unrestricted breathing while maintaining a stable pack. Uses shock cord with good stretch for unrestricted breathing but also good rebound on the stretch for a stable ride. Patent Pending.\u003cbr\u003e\n\u003cbr\u003e\n• Plush feeling micro-fiber polyester edges, soft and non-abrasive against skin and clothing.\u003cbr\u003e\n\u003cbr\u003e\n• Sweat proof webbing—won’t absorb water or get saturated and heavy.\u003cbr\u003e\n\u003cbr\u003e\n• Safety stitched bar tack on all stress points.\u003cbr\u003e\n\u003cbr\u003e\n• Quiet, bounce free, easy to see and use, zipper pulls.\u003cbr\u003e\n\u003cbr\u003e\n• Zig zagged stitching over elastic for ultra-durability, increased stretch and rebound.\u003cbr\u003e\n\u003cbr\u003e\n• Simple, fast, easy in and out bladder attachment.\u003cbr\u003e\n\u003cbr\u003e\n• Rapid access sweat-free magnon pocket for to pills and other essentials. Patent pending.\u003cbr\u003e\n\u003cbr\u003e\nFit: Unisex\u003cbr\u003e\n\u003cbr\u003e\nSize(s): XXS (26”-32”), XS (28”-34”), SM (30”- 36”), MD (32”-38”), LG,(34”-40”)\u003cbr\u003e\n\u003cbr\u003e\nHydration (included): 2L Reservoir with mag-clip to secure hose.\u003cbr\u003e\n\u003cbr\u003e\nBottle Compatible (not included): UltraFlask, Formula 250, Human 20 oz 2.0, or Collapsible Bottle Capacity: 854 c.i. (14 L)\u003cbr\u003e\n\u003cbr\u003e\nWeight: 16.0 oz (454 g)\u003cbr\u003e\n\u003cbr\u003e\nBuilt for the competitive athlete. Our Race Line focuses on Ultra \u0026amp; Trail running but can be used in any running scanario. Our Race Line products are sized to fit the athletic body, feature UltrAcool technology for maximum breathability on all race vests, made with very lightweight material for comfort during long distances, and created for pure performance.\u003cbr\u003e\n\u003cbr\u003e\nHydration Included\u003cbr\u003e\n\u003cbr\u003e\n2L Reservoir with mag-clip to secure hose\u003cbr\u003e\n\u003cbr\u003e\n2L Reservoir with mag-clip to secure hose\u003cbr\u003e\n\u003cbr\u003e\nNot included\u003cbr\u003e\n\u003cbr\u003e\nNot included\u003cbr\u003e\n\u003cbr\u003e\nSizes\u003cbr\u003e\n\u003cbr\u003e\nSmall (30″-34″), Medium (33″-37″) or Large (36″-42″)\u003cbr\u003e\n\u003cbr\u003e\nXXS (26”-32”), XS (28”-34”), SM (30”- 36”), MD (32”-38”), LG,(34”-40”)\u003cbr\u003e\n\u003cbr\u003e\nUniversal\u003cbr\u003e\n\u003cbr\u003e\nUniversal\u003cbr\u003e\n\u003cbr\u003e\n14.0 oz (396 g)\u003cbr\u003e\n\u003cbr\u003e\n16.0 oz (454 g)\u003cbr\u003e\n\u003cbr\u003e\n33 oz (935 g) with frame \/ 26 oz (737 g) without frame\u003cbr\u003e\n\u003cbr\u003e\n18 oz (510 g)\u003cbr\u003e\n\u003cbr\u003e\n570 c.i. (9.34 L)\u003cbr\u003e\n\u003cbr\u003e\n854 c.i. (14 L)\u003cbr\u003e\n\u003cbr\u003e\n1526 c.i. (25 L)\u003cbr\u003e\n\u003cbr\u003e\n915 c.i. (15 L)\u003cbr\u003e\n\u003cbr\u003e\nRecommended Use\u003cbr\u003e\n\u003cbr\u003e\nFrom 50 k to 100-mile ultra-trail racing in high mountains or with the lists of gear required\u003cbr\u003e\n\u003cbr\u003e\nFastpacking, mountain biking, racing, ultra racing, and summit assaulting.\u003cbr\u003e\n\u003cbr\u003e\nTrail Runing, Mountain Biking, Canyoneering, Fast Packing, Mountaineering, Rock Climbing.\u003cbr\u003e\n\u003cbr\u003e\nExtreme multi-day, self-supported endeavors. Mountain biking, rock climbing, trail running, canyoneering.\n\u003cbr\u003e\n\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eFEATURES - Quiet, bounce free, lightweight, soft, breathable, but strong; its large-holed mesh pulls moisture away from the body to keep skin dry and cool; sweat-proof webbing which won’t absorb water or get saturated and heavy\u003c\/li\u003e\n\u003cli\u003eFLUID CAPACITY - 2L reservoir with mag-clip to secure the hose; compatible with UltraFlask, Formula 250, Human 20 oz 2.0, or collapsible bottle (not included)\u003c\/li\u003e\n\u003cli\u003eMAX O2 STERNUM - For unrestricted breathing while maintaining a stable pack. Uses shock cord with good stretch for unrestricted breathing but also good rebound on the stretch for a stable ride\u003c\/li\u003e\n\u003cli\u003eCARRY EVERYTHING YOU NEED - Rapid access pocket and let the consumer decide what goes in, such as gels, foods, pills, electrolytes, keys, a cell phone or any other small personal device, a credit card or money, and even light clothing\u003c\/li\u003e\n\u003cli\u003eRECOMMENDED USE - For fast-packing and mountain biking; in a fast race, ultra-race, or a summit assaults this hydration backpack is the solution for any athlete\u003c\/li\u003e\n\u003c\/ul\u003e","published_at":"2019-09-23T13:06:29-05:00","created_at":"2019-09-23T12:44:13-05:00","vendor":"Ultraspire","type":"Misc.","tags":["150-200","color-black","color-blue","color-yellow"],"price":17495,"price_min":17495,"price_max":17495,"available":true,"price_varies":false,"compare_at_price":null,"compare_at_price_min":0,"compare_at_price_max":0,"compare_at_price_varies":false,"variants":[{"id":30237389455462,"title":"Emerald Blue \/ Medium","option1":"Emerald Blue","option2":"Medium","option3":null,"sku":"GRV184329","requires_shipping":true,"taxable":true,"featured_image":{"id":12760294228070,"product_id":4117940240486,"position":3,"created_at":"2019-09-23T12:44:13-05:00","updated_at":"2020-04-01T20:17:11-05:00","alt":"Ultraspire Zygos 4.0 Hydration Pack | 2L BPA \u0026 PVC Free Reservoir with Mag-Clip - 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Emerald Blue \/ Medium","id":1439295635558,"position":3,"preview_image":{"aspect_ratio":1.0,"height":500,"width":500,"src":"https:\/\/cdn.shopify.com\/s\/files\/1\/1289\/1975\/products\/full_30bb580f-eed2-4263-8f55-b581c35c75bf.jpg?v=1569260653"},"aspect_ratio":1.0,"height":500,"media_type":"image","src":"https:\/\/cdn.shopify.com\/s\/files\/1\/1289\/1975\/products\/full_30bb580f-eed2-4263-8f55-b581c35c75bf.jpg?v=1569260653","width":500},{"alt":"Ultraspire Zygos 4.0 Hydration Pack | 2L BPA \u0026 PVC Free Reservoir with Mag-Clip - [variant_title]","id":1439295668326,"position":4,"preview_image":{"aspect_ratio":1.0,"height":500,"width":500,"src":"https:\/\/cdn.shopify.com\/s\/files\/1\/1289\/1975\/products\/full_531bffde-f6bc-4aa8-9e5e-580cb7a6e5ef.jpg?v=1569260653"},"aspect_ratio":1.0,"height":500,"media_type":"image","src":"https:\/\/cdn.shopify.com\/s\/files\/1\/1289\/1975\/products\/full_531bffde-f6bc-4aa8-9e5e-580cb7a6e5ef.jpg?v=1569260653","width":500}],"content":"Bryce Thatcher’s pack of choice, the Zygos 4.0 hydration pack is very versatile. This pack is lightweight and high capacity, a comfortable wrap around style with full compression allow for the lowest profile empty or fully loaded. The Zygos 4.0 comes with a 2L reservoir and a magnetic clip to keep your hands free. Whether you are fastpacking, mountain biking, in a fast race, ultra-race, or a summit assaults this hydration backpack is the solution for any athlete. Now available in five sizes.\u003cbr\u003e\n\u003cbr\u003e\nDetails\u003cbr\u003e\n\u003cbr\u003e\n• Lightweight, soft, breathable, but strong, large-holed mesh pulls moisture away from the body to keep skin dry and cool.\u003cbr\u003e\n\u003cbr\u003e\n• Silicone and PU coated feather-weight nylon fabrics resist water, abrasion and tears.\u003cbr\u003e\n\u003cbr\u003e\n• Max O2 Sternum for unrestricted breathing while maintaining a stable pack. Uses shock cord with good stretch for unrestricted breathing but also good rebound on the stretch for a stable ride. Patent Pending.\u003cbr\u003e\n\u003cbr\u003e\n• Plush feeling micro-fiber polyester edges, soft and non-abrasive against skin and clothing.\u003cbr\u003e\n\u003cbr\u003e\n• Sweat proof webbing—won’t absorb water or get saturated and heavy.\u003cbr\u003e\n\u003cbr\u003e\n• Safety stitched bar tack on all stress points.\u003cbr\u003e\n\u003cbr\u003e\n• Quiet, bounce free, easy to see and use, zipper pulls.\u003cbr\u003e\n\u003cbr\u003e\n• Zig zagged stitching over elastic for ultra-durability, increased stretch and rebound.\u003cbr\u003e\n\u003cbr\u003e\n• Simple, fast, easy in and out bladder attachment.\u003cbr\u003e\n\u003cbr\u003e\n• Rapid access sweat-free magnon pocket for to pills and other essentials. Patent pending.\u003cbr\u003e\n\u003cbr\u003e\nFit: Unisex\u003cbr\u003e\n\u003cbr\u003e\nSize(s): XXS (26”-32”), XS (28”-34”), SM (30”- 36”), MD (32”-38”), LG,(34”-40”)\u003cbr\u003e\n\u003cbr\u003e\nHydration (included): 2L Reservoir with mag-clip to secure hose.\u003cbr\u003e\n\u003cbr\u003e\nBottle Compatible (not included): UltraFlask, Formula 250, Human 20 oz 2.0, or Collapsible Bottle Capacity: 854 c.i. (14 L)\u003cbr\u003e\n\u003cbr\u003e\nWeight: 16.0 oz (454 g)\u003cbr\u003e\n\u003cbr\u003e\nBuilt for the competitive athlete. Our Race Line focuses on Ultra \u0026amp; Trail running but can be used in any running scanario. Our Race Line products are sized to fit the athletic body, feature UltrAcool technology for maximum breathability on all race vests, made with very lightweight material for comfort during long distances, and created for pure performance.\u003cbr\u003e\n\u003cbr\u003e\nHydration Included\u003cbr\u003e\n\u003cbr\u003e\n2L Reservoir with mag-clip to secure hose\u003cbr\u003e\n\u003cbr\u003e\n2L Reservoir with mag-clip to secure hose\u003cbr\u003e\n\u003cbr\u003e\nNot included\u003cbr\u003e\n\u003cbr\u003e\nNot included\u003cbr\u003e\n\u003cbr\u003e\nSizes\u003cbr\u003e\n\u003cbr\u003e\nSmall (30″-34″), Medium (33″-37″) or Large (36″-42″)\u003cbr\u003e\n\u003cbr\u003e\nXXS (26”-32”), XS (28”-34”), SM (30”- 36”), MD (32”-38”), LG,(34”-40”)\u003cbr\u003e\n\u003cbr\u003e\nUniversal\u003cbr\u003e\n\u003cbr\u003e\nUniversal\u003cbr\u003e\n\u003cbr\u003e\n14.0 oz (396 g)\u003cbr\u003e\n\u003cbr\u003e\n16.0 oz (454 g)\u003cbr\u003e\n\u003cbr\u003e\n33 oz (935 g) with frame \/ 26 oz (737 g) without frame\u003cbr\u003e\n\u003cbr\u003e\n18 oz (510 g)\u003cbr\u003e\n\u003cbr\u003e\n570 c.i. (9.34 L)\u003cbr\u003e\n\u003cbr\u003e\n854 c.i. (14 L)\u003cbr\u003e\n\u003cbr\u003e\n1526 c.i. (25 L)\u003cbr\u003e\n\u003cbr\u003e\n915 c.i. (15 L)\u003cbr\u003e\n\u003cbr\u003e\nRecommended Use\u003cbr\u003e\n\u003cbr\u003e\nFrom 50 k to 100-mile ultra-trail racing in high mountains or with the lists of gear required\u003cbr\u003e\n\u003cbr\u003e\nFastpacking, mountain biking, racing, ultra racing, and summit assaulting.\u003cbr\u003e\n\u003cbr\u003e\nTrail Runing, Mountain Biking, Canyoneering, Fast Packing, Mountaineering, Rock Climbing.\u003cbr\u003e\n\u003cbr\u003e\nExtreme multi-day, self-supported endeavors. Mountain biking, rock climbing, trail running, canyoneering.\n\u003cbr\u003e\n\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eFEATURES - Quiet, bounce free, lightweight, soft, breathable, but strong; its large-holed mesh pulls moisture away from the body to keep skin dry and cool; sweat-proof webbing which won’t absorb water or get saturated and heavy\u003c\/li\u003e\n\u003cli\u003eFLUID CAPACITY - 2L reservoir with mag-clip to secure the hose; compatible with UltraFlask, Formula 250, Human 20 oz 2.0, or collapsible bottle (not included)\u003c\/li\u003e\n\u003cli\u003eMAX O2 STERNUM - For unrestricted breathing while maintaining a stable pack. Uses shock cord with good stretch for unrestricted breathing but also good rebound on the stretch for a stable ride\u003c\/li\u003e\n\u003cli\u003eCARRY EVERYTHING YOU NEED - Rapid access pocket and let the consumer decide what goes in, such as gels, foods, pills, electrolytes, keys, a cell phone or any other small personal device, a credit card or money, and even light clothing\u003c\/li\u003e\n\u003cli\u003eRECOMMENDED USE - For fast-packing and mountain biking; in a fast race, ultra-race, or a summit assaults this hydration backpack is the solution for any athlete\u003c\/li\u003e\n\u003c\/ul\u003e"}

Ultraspire Zygos 4.0 Hydration Pack | 2L BPA & PVC Free Reservoir with Mag-Clip

$174.95
Ultraspire

Ultraspire Zygos 4.0 Hydration Pack | 2L BPA & PVC Free Reservoir with Mag-Clip

$174.95

Grivet Members get back an estimated $17 on this item as part of their member rewards.

Maximum quantity available reached.

More from Ultraspire

Bryce Thatcher’s pack of choice, the Zygos 4.0 hydration pack is very versatile. This pack is lightweight and high capacity, a comfortable wrap around style with full compression allow for the lowest profile empty or fully loaded. The Zygos 4.0 comes with a 2L reservoir and a magnetic clip to keep your hands free. Whether you are fastpacking, mountain biking, in a fast race, ultra-race, or a summit assaults this hydration backpack is the solution for any athlete. Now available in five sizes.

Details

• Lightweight, soft, breathable, but strong, large-holed mesh pulls moisture away from the body to keep skin dry and cool.

• Silicone and PU coated feather-weight nylon fabrics resist water, abrasion and tears.

• Max O2 Sternum for unrestricted breathing while maintaining a stable pack. Uses shock cord with good stretch for unrestricted breathing but also good rebound on the stretch for a stable ride. Patent Pending.

• Plush feeling micro-fiber polyester edges, soft and non-abrasive against skin and clothing.

• Sweat proof webbing—won’t absorb water or get saturated and heavy.

• Safety stitched bar tack on all stress points.

• Quiet, bounce free, easy to see and use, zipper pulls.

• Zig zagged stitching over elastic for ultra-durability, increased stretch and rebound.

• Simple, fast, easy in and out bladder attachment.

• Rapid access sweat-free magnon pocket for to pills and other essentials. Patent pending.

Fit: Unisex

Size(s): XXS (26”-32”), XS (28”-34”), SM (30”- 36”), MD (32”-38”), LG,(34”-40”)

Hydration (included): 2L Reservoir with mag-clip to secure hose.

Bottle Compatible (not included): UltraFlask, Formula 250, Human 20 oz 2.0, or Collapsible Bottle Capacity: 854 c.i. (14 L)

Weight: 16.0 oz (454 g)

Built for the competitive athlete. Our Race Line focuses on Ultra & Trail running but can be used in any running scanario. Our Race Line products are sized to fit the athletic body, feature UltrAcool technology for maximum breathability on all race vests, made with very lightweight material for comfort during long distances, and created for pure performance.

Hydration Included

2L Reservoir with mag-clip to secure hose

2L Reservoir with mag-clip to secure hose

Not included

Not included

Sizes

Small (30″-34″), Medium (33″-37″) or Large (36″-42″)

XXS (26”-32”), XS (28”-34”), SM (30”- 36”), MD (32”-38”), LG,(34”-40”)

Universal

Universal

14.0 oz (396 g)

16.0 oz (454 g)

33 oz (935 g) with frame / 26 oz (737 g) without frame

18 oz (510 g)

570 c.i. (9.34 L)

854 c.i. (14 L)

1526 c.i. (25 L)

915 c.i. (15 L)

Recommended Use

From 50 k to 100-mile ultra-trail racing in high mountains or with the lists of gear required

Fastpacking, mountain biking, racing, ultra racing, and summit assaulting.

Trail Runing, Mountain Biking, Canyoneering, Fast Packing, Mountaineering, Rock Climbing.

Extreme multi-day, self-supported endeavors. Mountain biking, rock climbing, trail running, canyoneering.

  • FEATURES - Quiet, bounce free, lightweight, soft, breathable, but strong; its large-holed mesh pulls moisture away from the body to keep skin dry and cool; sweat-proof webbing which won’t absorb water or get saturated and heavy
  • FLUID CAPACITY - 2L reservoir with mag-clip to secure the hose; compatible with UltraFlask, Formula 250, Human 20 oz 2.0, or collapsible bottle (not included)
  • MAX O2 STERNUM - For unrestricted breathing while maintaining a stable pack. Uses shock cord with good stretch for unrestricted breathing but also good rebound on the stretch for a stable ride
  • CARRY EVERYTHING YOU NEED - Rapid access pocket and let the consumer decide what goes in, such as gels, foods, pills, electrolytes, keys, a cell phone or any other small personal device, a credit card or money, and even light clothing
  • RECOMMENDED USE - For fast-packing and mountain biking; in a fast race, ultra-race, or a summit assaults this hydration backpack is the solution for any athlete

How To Measure Your Shoe Size

Here are the best shoe size conversion charts - in US, UK, European, and inches, for men's, kid's and women's shoes. 
 
If you've ever wondered "What size shoe is a 38?" (It is a men's size 7.5 in the US) or "What is a size 40 in shoes?" (that'd be a US men's size 9.5), read on to learn how to measure shoe sizes in different countries.
 
How do you measure shoe size? It is possible to measure your own foot using a ruler or a Brannock device, but since our feet our three dimensional, this will only approximate your measurements. After you've measured your foot, try using our conversion charts below to see what your size is. Be mindful that different brands, like Altra running shoes vs. Brooks running shoes vs. Oboz hiking boots, maybe run slightly different in sizes. 
 
Women's Shoe Size Conversions
US Sizes Euro Sizes UK Sizes Inches CM
4 35 2 8.1875" 20.8
4.5 35 2.5 8.375" 21.3
5 35-36 3 8.5" 21.6
5.5 36 3.5 8.75" 22.2
6 36-37 4 8.875" 22.5
6.5 37 4.5 9.0625" 23
7 37-38 5 9.25" 23.5
7.5 38 5.5 9.375" 23.8
8 38-39 6 9.5" 24.1
8.5 39 6.5 9.6875" 24.6
9 39-40 7 9.875" 25.1
9.5 40 7.5 10" 25.4
10 40-41 8 10.1875" 25.9
10.5 41 8.5 10.3125" 26.2
11 41-42 9 10.5" 26.7
11.5 42 9.5 10.6875" 27.1
12 42-43 10 10.875" 27.6

Men's Shoe Size Conversions

US Sizes Euro Sizes UK Sizes Inches CM
6 39 5.5 9.25" 23.5
6.5 39 6 9.5" 24.1
7 40 6.5 9.625" 24.4
7.5 40-41 7 9.75" 24.8
8 41 7.5 9.9375" 25.4
8.5 41-42 8 10.125" 25.7
9 42 8.5 10.25" 26
9.5 42-43 9 10.4375" 26.7
10 43 9.5 10.5625" 27
10.5 43-44 10 10.75" 27.3
11 44 10.5 10.9375" 27.9
11.5 44-45 11 11.125" 28.3
12 45 11.5 11.25" 28.6
13 46 12.5 11.5625" 29.4
14 47 13.5 11.875" 30.2
15 48 14.5 12.1875" 31
16 49 15.5 12.5" 31.8
Big Kid Shoe Size Conversions (7 – 12 years)
US Sizes Euro Sizes UK Sizes Inches CM
3.5 35 2.5 8.625" 21.9
4 36 3 8.75" 22.2
4.5 36 3.5 9" 22.9
5 37 4 9.125" 23.2
5.5 37 4.5 9.25" 23.5
6 38 5 9.5" 24.1
6.5 38 5.5 9.625" 24.4
7 39 6 9.75" 24.8
Little Kid Shoe Size Conversions (4 – 7 years)
US Sizes Euro Sizes UK Sizes Inches CM
10.5 27 9.5 6.625" 16.8
11 28 10 6.75" 17.1
11.5 29 10.5 7" 17.8
12 30 11 7.125" 18.1
12.5 30 11.5 7.25" 18.4
13 31 12 7.5" 19.1
13.5 31 12.5 7.625" 19.4
1 32 13 7.75" 19.7
1.5 33 14 8" 20.3
2 33 1 8.125" 20.6
2.5 34 1.5 8.25" 21
3 34 2 8.5" 21.6

FAQ & Tips

  • What if I am between shoe sizes? We recommend you should size up, especially in active & sports shoes. This includes running shoes and hiking boots. 
  • Does 0.5 size make a difference in shoes? Yes, it certainly does! Wearing shoes that are too small can cause pain and injuries. Blisters, lose of toenails and bunions can all result from wearing shoes that are even 0.5 size too small. These are common ailments of beginner runners. 
  • Is one foot bigger than the other? It is common for people to have one foot that is slightly bigger than the other. Our tip is that you should buy shoes that fit the larger foot (buy pairs of shoes in the larger size of the two). 
  • Should shoes be tight or lose? Unfortunately, this is not a simple question. Shoes should not be too tight or too lose. You should be able to put a thumbs width at the end of your toe box, between your big toe and the pointy end of the shoe. You should also be able to snuggly fit your index finger between your heel and the back of the shoe. If you have not much (or not enough!) space in either of these areas, try a different size shoe. 
  • When should I try on shoes? A great tip for runners is to try on running shoes at the end of a work day. As you run, just like when you are on your feet for work, your feet swell. You will want to try on running shoes when your feet are at their largest. This allows them to still fit comfortably after a long distance run. 
  • What size shoe should I buy? This shoe chart is not a guarantee your shoes will fit. If you are in the area of Memphis, Tennessee, run on in to one of our running specialty & gear stores and our experienced fit experts will help you out!

Image below: A Brannock device is one tool run specialists use to measure shoe size. It can measure not only foot length, but also foot width. 

How to measure shoe size - Brannock Device

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