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{"id":6553561694310,"title":"Ultraspire Astral 4.0 Women's Specific Hydration Pack - Fluid Capacity 2 L Reservoir Included","handle":"ultraspire-astral-4-0-womens-specific-hydration-pack-fluid-capacity-2-l-reservoir-included","description":"Weight\u003cbr\u003e\u003cbr\u003e13.6 oz (386 g)\u003cbr\u003e\u003cbr\u003e6.4 oz (181 g)\u003cbr\u003e\u003cbr\u003e10.4 oz (295 g)\u003cbr\u003e\u003cbr\u003e10 oz (283g) with insert\u003cbr\u003e\u003cbr\u003e8.0 oz (227 g)\u003cbr\u003e\u003cbr\u003e9.4 oz (266 g) with bottle\u003cbr\u003e\u003cbr\u003eSize range\u003cbr\u003e\u003cbr\u003eUniversal Size\u003cbr\u003e\u003cbr\u003eUniversal Size\u003cbr\u003e\u003cbr\u003eUniversal Size\u003cbr\u003e\u003cbr\u003eSM (31” - 36”), MD (34” - 39”), LG (37” - 42”)\u003cbr\u003e\u003cbr\u003eSM (26”- 35”), MD (32”-38”), LG (38”- 46”)\u003cbr\u003e\u003cbr\u003eUniversal Size\u003cbr\u003e\u003cbr\u003eHydration Included\u003cbr\u003e\u003cbr\u003e1 x 2 L Reservoir\u003cbr\u003e\u003cbr\u003eNot Included\u003cbr\u003e\u003cbr\u003eNot Included\u003cbr\u003e\u003cbr\u003eNot Included\u003cbr\u003e\u003cbr\u003eNot Included\u003cbr\u003e\u003cbr\u003e550 mL UltraFlask\u003cbr\u003e\u003cbr\u003eCapacity\u003cbr\u003e\u003cbr\u003e549 c.i. (9 L)\u003cbr\u003e\u003cbr\u003e214 c.i. (3.5 L)\u003cbr\u003e\u003cbr\u003e610 c.i. (10 L)\u003cbr\u003e\u003cbr\u003e366 c.i. (6 L)\u003cbr\u003e\u003cbr\u003e336 c.i. (6 L)\u003cbr\u003e\u003cbr\u003e122 c.i. (2 L)\u003cbr\u003e\u003cbr\u003eLine\u003cbr\u003e\u003cbr\u003eEssential Line\u003cbr\u003e\u003cbr\u003eEssential Line\u003cbr\u003e\u003cbr\u003eEssential Line\u003cbr\u003e\u003cbr\u003eRace Line\u003cbr\u003e\u003cbr\u003eRace line\u003cbr\u003e\u003cbr\u003eRace Line\u003cbr\u003e\u003cbr\u003eTechnology\u003cbr\u003e\u003cbr\u003eHerFit Harness, On-The-Go Pockets, Distributed Weight, UltrAcool System, Max02 System, Durable and Light Weight Fabrics\u003cbr\u003e\u003cbr\u003eErgoFit, On-The-Go Pockets, Durable and Lightweight Fabrics, Distributed Weight, Max02 System, UltrAcool System\u003cbr\u003e\u003cbr\u003eErgoFit, On-The-Go Pockets, Distributed Weight, UltrAcool System, Max 02 System\u003cbr\u003e\u003cbr\u003eErgoFit, On-The-Go Pockets, Distributed Weight, UltrAcool System, Max02 System, Durable and Light Weight Fabrics\u003cbr\u003e\u003cbr\u003eErgoFit, On-The-Go Pockets, Distributed Weight, UltrAcool System, Max02 System, Durable and Light Weight Fabrics\u003cbr\u003e\u003cbr\u003eErgoFit, On-The-Go Pockets, Distributed Weight, Durable and Lightweight Fabrics, Max02 System, UltrAcool System\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eHERFIT HARNESS - The HerFit Harness is a securing strap system designed specifically to fit women. The straps allow for the chest, heart, and lungs to be free with no restriction to the open air. Designed for a no-chafe, no-hindrance fit, the HerFit Harness provides long term comfort and allows for the ability to perform at the highest level while having your essentials directly at your fingertips when you need them.\u003c\/li\u003e\n\u003cli\u003eON-THE-GO POCKETS \u0026amp; DISTRIBUTED WEIGHT - The pack is built with efficiency in mind, designed to ensure that you can access all core components on the go with little energy expended. The waist packs are designed with a 2\/3 1\/3 weight ratio creating more stability with less tension and balances the weight naturally. The lower load placement allows for a better center of gravity and efficiency on technical terrain.\u003c\/li\u003e\n\u003cli\u003eULTRACOOL LIGHT MESH - This flex mono mesh remains very lightweight during long and hot endeavors. Breathable yet durable, this mesh’s build quality adds resilience to your pack without compromising weight.\u003c\/li\u003e\n\u003cli\u003eMAX02 SYSTEM - The Max02 System is a shock cord securing system that helps create a comfortable \u0026amp; natural breathing pattern while at the same time keeping the pack secure. The shock cord allows for stretch outward and 100% rebound which keeps the pack snug against your body empty or fully loaded with no restriction of movement. Fluid Capacity 2 L Reservoir Included.\u003c\/li\u003e\n\u003cli\u003eDURABLE \u0026amp; LIGHT WEIGHT FABRICS - Materials are selected for their high strength to weight ratio and deliberately placed and constructed for maximum durability. Abrasion-resistant fabrics withstand areas of terrain contact. Reinforced panels are strategically placed at high-stress points.\u003c\/li\u003e\n\u003c\/ul\u003e","published_at":"2021-04-29T05:17:04-05:00","created_at":"2021-03-29T11:53:39-05:00","vendor":"Ultraspire","type":"Running \u0026 Fitness","tags":["100-150","gender-women","size-default-title","ultraspire"],"price":13995,"price_min":13995,"price_max":13995,"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":39282275647590,"title":"Default Title","option1":"Default Title","option2":null,"option3":null,"sku":"GRV509334","requires_shipping":true,"taxable":true,"featured_image":null,"available":true,"name":"Ultraspire Astral 4.0 Women's Specific Hydration Pack - Fluid Capacity 2 L Reservoir Included","public_title":null,"options":["Default Title"],"price":13995,"weight":0,"compare_at_price":null,"inventory_quantity":2,"inventory_management":"shopify","inventory_policy":"deny","barcode":"","requires_selling_plan":false,"selling_plan_allocations":[]}],"images":["\/\/cdn.shopify.com\/s\/files\/1\/1289\/1975\/products\/medium_7ba3ed1b-c05f-4786-9271-d513c1a55ee4.jpg?v=1626220588","\/\/cdn.shopify.com\/s\/files\/1\/1289\/1975\/products\/medium_fa81323e-8463-4e6f-b1e9-45ef358edc8f.jpg?v=1626220589","\/\/cdn.shopify.com\/s\/files\/1\/1289\/1975\/products\/medium_af577b83-90d8-4b95-a5ff-9952721cc9f7.jpg?v=1626220590","\/\/cdn.shopify.com\/s\/files\/1\/1289\/1975\/products\/medium_27646728-4fe9-4b74-8c4e-6867b614154e.jpg?v=1626220591","\/\/cdn.shopify.com\/s\/files\/1\/1289\/1975\/products\/medium_8dd75a34-d067-4ddf-bc3d-05ffd8d2861b.jpg?v=1626220592","\/\/cdn.shopify.com\/s\/files\/1\/1289\/1975\/products\/medium_a8b440f9-3197-49d0-87e5-71c5ceee1040.jpg?v=1626220593","\/\/cdn.shopify.com\/s\/files\/1\/1289\/1975\/products\/medium_851ee86a-4923-4303-a67a-2fd2bddbdd84.jpg?v=1626220594"],"featured_image":"\/\/cdn.shopify.com\/s\/files\/1\/1289\/1975\/products\/medium_7ba3ed1b-c05f-4786-9271-d513c1a55ee4.jpg?v=1626220588","options":["Color"],"media":[{"alt":"Ultraspire Astral 4.0 Women's Specific Hydration Pack - 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36”), MD (34” - 39”), LG (37” - 42”)\u003cbr\u003e\u003cbr\u003eSM (26”- 35”), MD (32”-38”), LG (38”- 46”)\u003cbr\u003e\u003cbr\u003eUniversal Size\u003cbr\u003e\u003cbr\u003eHydration Included\u003cbr\u003e\u003cbr\u003e1 x 2 L Reservoir\u003cbr\u003e\u003cbr\u003eNot Included\u003cbr\u003e\u003cbr\u003eNot Included\u003cbr\u003e\u003cbr\u003eNot Included\u003cbr\u003e\u003cbr\u003eNot Included\u003cbr\u003e\u003cbr\u003e550 mL UltraFlask\u003cbr\u003e\u003cbr\u003eCapacity\u003cbr\u003e\u003cbr\u003e549 c.i. (9 L)\u003cbr\u003e\u003cbr\u003e214 c.i. (3.5 L)\u003cbr\u003e\u003cbr\u003e610 c.i. (10 L)\u003cbr\u003e\u003cbr\u003e366 c.i. (6 L)\u003cbr\u003e\u003cbr\u003e336 c.i. (6 L)\u003cbr\u003e\u003cbr\u003e122 c.i. (2 L)\u003cbr\u003e\u003cbr\u003eLine\u003cbr\u003e\u003cbr\u003eEssential Line\u003cbr\u003e\u003cbr\u003eEssential Line\u003cbr\u003e\u003cbr\u003eEssential Line\u003cbr\u003e\u003cbr\u003eRace Line\u003cbr\u003e\u003cbr\u003eRace line\u003cbr\u003e\u003cbr\u003eRace Line\u003cbr\u003e\u003cbr\u003eTechnology\u003cbr\u003e\u003cbr\u003eHerFit Harness, On-The-Go Pockets, Distributed Weight, UltrAcool System, Max02 System, Durable and Light Weight Fabrics\u003cbr\u003e\u003cbr\u003eErgoFit, On-The-Go Pockets, Durable and Lightweight Fabrics, Distributed Weight, Max02 System, UltrAcool System\u003cbr\u003e\u003cbr\u003eErgoFit, On-The-Go Pockets, Distributed Weight, UltrAcool System, Max 02 System\u003cbr\u003e\u003cbr\u003eErgoFit, On-The-Go Pockets, Distributed Weight, UltrAcool System, Max02 System, Durable and Light Weight Fabrics\u003cbr\u003e\u003cbr\u003eErgoFit, On-The-Go Pockets, Distributed Weight, UltrAcool System, Max02 System, Durable and Light Weight Fabrics\u003cbr\u003e\u003cbr\u003eErgoFit, On-The-Go Pockets, Distributed Weight, Durable and Lightweight Fabrics, Max02 System, UltrAcool System\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eHERFIT HARNESS - The HerFit Harness is a securing strap system designed specifically to fit women. The straps allow for the chest, heart, and lungs to be free with no restriction to the open air. Designed for a no-chafe, no-hindrance fit, the HerFit Harness provides long term comfort and allows for the ability to perform at the highest level while having your essentials directly at your fingertips when you need them.\u003c\/li\u003e\n\u003cli\u003eON-THE-GO POCKETS \u0026amp; DISTRIBUTED WEIGHT - The pack is built with efficiency in mind, designed to ensure that you can access all core components on the go with little energy expended. The waist packs are designed with a 2\/3 1\/3 weight ratio creating more stability with less tension and balances the weight naturally. The lower load placement allows for a better center of gravity and efficiency on technical terrain.\u003c\/li\u003e\n\u003cli\u003eULTRACOOL LIGHT MESH - This flex mono mesh remains very lightweight during long and hot endeavors. Breathable yet durable, this mesh’s build quality adds resilience to your pack without compromising weight.\u003c\/li\u003e\n\u003cli\u003eMAX02 SYSTEM - The Max02 System is a shock cord securing system that helps create a comfortable \u0026amp; natural breathing pattern while at the same time keeping the pack secure. The shock cord allows for stretch outward and 100% rebound which keeps the pack snug against your body empty or fully loaded with no restriction of movement. Fluid Capacity 2 L Reservoir Included.\u003c\/li\u003e\n\u003cli\u003eDURABLE \u0026amp; LIGHT WEIGHT FABRICS - Materials are selected for their high strength to weight ratio and deliberately placed and constructed for maximum durability. Abrasion-resistant fabrics withstand areas of terrain contact. Reinforced panels are strategically placed at high-stress points.\u003c\/li\u003e\n\u003c\/ul\u003e"}

Ultraspire Astral 4.0 Women's Specific Hydration Pack - Fluid Capacity 2 L Reservoir Included

$139.95
Ultraspire

Ultraspire Astral 4.0 Women's Specific Hydration Pack - Fluid Capacity 2 L Reservoir Included

$139.95

Grivet Members get back an estimated $14 on this item as part of their member rewards.

Maximum quantity available reached.

More from Ultraspire

Weight

13.6 oz (386 g)

6.4 oz (181 g)

10.4 oz (295 g)

10 oz (283g) with insert

8.0 oz (227 g)

9.4 oz (266 g) with bottle

Size range

Universal Size

Universal Size

Universal Size

SM (31” - 36”), MD (34” - 39”), LG (37” - 42”)

SM (26”- 35”), MD (32”-38”), LG (38”- 46”)

Universal Size

Hydration Included

1 x 2 L Reservoir

Not Included

Not Included

Not Included

Not Included

550 mL UltraFlask

Capacity

549 c.i. (9 L)

214 c.i. (3.5 L)

610 c.i. (10 L)

366 c.i. (6 L)

336 c.i. (6 L)

122 c.i. (2 L)

Line

Essential Line

Essential Line

Essential Line

Race Line

Race line

Race Line

Technology

HerFit Harness, On-The-Go Pockets, Distributed Weight, UltrAcool System, Max02 System, Durable and Light Weight Fabrics

ErgoFit, On-The-Go Pockets, Durable and Lightweight Fabrics, Distributed Weight, Max02 System, UltrAcool System

ErgoFit, On-The-Go Pockets, Distributed Weight, UltrAcool System, Max 02 System

ErgoFit, On-The-Go Pockets, Distributed Weight, UltrAcool System, Max02 System, Durable and Light Weight Fabrics

ErgoFit, On-The-Go Pockets, Distributed Weight, UltrAcool System, Max02 System, Durable and Light Weight Fabrics

ErgoFit, On-The-Go Pockets, Distributed Weight, Durable and Lightweight Fabrics, Max02 System, UltrAcool System
  • HERFIT HARNESS - The HerFit Harness is a securing strap system designed specifically to fit women. The straps allow for the chest, heart, and lungs to be free with no restriction to the open air. Designed for a no-chafe, no-hindrance fit, the HerFit Harness provides long term comfort and allows for the ability to perform at the highest level while having your essentials directly at your fingertips when you need them.
  • ON-THE-GO POCKETS & DISTRIBUTED WEIGHT - The pack is built with efficiency in mind, designed to ensure that you can access all core components on the go with little energy expended. The waist packs are designed with a 2/3 1/3 weight ratio creating more stability with less tension and balances the weight naturally. The lower load placement allows for a better center of gravity and efficiency on technical terrain.
  • ULTRACOOL LIGHT MESH - This flex mono mesh remains very lightweight during long and hot endeavors. Breathable yet durable, this mesh’s build quality adds resilience to your pack without compromising weight.
  • MAX02 SYSTEM - The Max02 System is a shock cord securing system that helps create a comfortable & natural breathing pattern while at the same time keeping the pack secure. The shock cord allows for stretch outward and 100% rebound which keeps the pack snug against your body empty or fully loaded with no restriction of movement. Fluid Capacity 2 L Reservoir Included.
  • DURABLE & LIGHT WEIGHT FABRICS - Materials are selected for their high strength to weight ratio and deliberately placed and constructed for maximum durability. Abrasion-resistant fabrics withstand areas of terrain contact. Reinforced panels are strategically placed at high-stress points.

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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