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{"id":6732463341670,"title":"Ultraspire Nucleus Unisex Lightweight Vest - 31 c.i. 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(5L)\u003cbr\u003e\u003cbr\u003e31 c.i. (0.5 L)\u003cbr\u003e\u003cbr\u003e610 c.i. (10 L)\u003cbr\u003e\u003cbr\u003e214 c.i. (3.5 L)\u003cbr\u003e\u003cbr\u003eLine\u003cbr\u003e\u003cbr\u003eRace Line\u003cbr\u003e\u003cbr\u003eEssential Line\u003cbr\u003e\u003cbr\u003eRace Line\u003cbr\u003e\u003cbr\u003eEssential Line\u003cbr\u003e\u003cbr\u003eTechnology\u003cbr\u003e\u003cbr\u003eErgoFit, Ergo X Harness, On-The-Go Pockets, Distributed Weight, Durable and Lightweight Fabrics, Max02 System, UltrAcool System, Max02 Waist\u003cbr\u003e\u003cbr\u003eErgoFit, Ergo X Harness, Durable and Lightweight Fabrics, UltrAcool System\u003cbr\u003e\u003cbr\u003eErgoFit, On-The-Go Pockets, Distributed Weight, UltrAcool System, MaxO2 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\u003cul\u003e\n\u003cli\u003e100% Nylon\u003c\/li\u003e\n\u003cli\u003eErgo X Harness - This vest features our patented Ergo X Harness which is an over-the-head securing system that places capacity on the body’s natural load bearing positions and keeps the soft tissue areas free from restriction.\u003c\/li\u003e\n\u003cli\u003eMax02 Waist - The Nucleus utilizes the Max02 Waist closure system which provides an incredible fit with easy adjustment, but also allows for an uninterrupted natural breathing pattern.\u003c\/li\u003e\n\u003cli\u003eDurable and Lightweight Fabrics - The bottom of this compartment has been reinforced with a dual layer of nylon at the stress point for durability. This pack features the UltrAcool Light Mesh for added durability and breathability. Weight: 7.2 oz (204g) with bottle, 4.8 oz (136g) without bottle.\u003c\/li\u003e\n\u003cli\u003eSweatproof Webbing and Water Resistant - Silicone and PU coated feather-weight nylon fabrics resist water, abrasion, and tears. It won’t absorb water or get saturated and heavy.\u003c\/li\u003e\n\u003cli\u003eComfortable - Plush feeling micro-fiber polyester edges, soft and non-abrasive against skin and clothing. Soft perimeter binding keeps contact with the skin comfortable during long runs.\u003c\/li\u003e\n\u003c\/ul\u003e"}

Ultraspire Nucleus Unisex Lightweight Vest - 31 c.i. (0.5L) Capacity: 1x UltraFlask 550 Hybrid Bottle (Included)

$84.95
Ultraspire

Ultraspire Nucleus Unisex Lightweight Vest - 31 c.i. (0.5L) Capacity: 1x UltraFlask 550 Hybrid Bottle (Included)

$84.95

Grivet Members get back an estimated $8 on this item as part of their member rewards.

Maximum quantity available reached.

More from Ultraspire

Weight

7.2 oz (204g) with bottle, 4.8 oz (136g) without bottle

2.8 oz (79 g)

11.2 oz (318g)

6.4 oz (181 g)

Size range

Unisex - Universal (Chest Size: 26″-48″)

Universal

Universal Size(s): 26″-48″

Universal Size

Hydration Included

Hydration Compatible: 1x UltraFlask 550 Hybrid Bottle

Not included

Not Included - Compatible (not included): 4 x UltraFlask 550, 2 SoftFlasks, 2L Reservoir 2.0

Not Included

Capacity

305 c.i. (5L)

31 c.i. (0.5 L)

610 c.i. (10 L)

214 c.i. (3.5 L)

Line

Race Line

Essential Line

Race Line

Essential Line

Technology

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

ErgoFit, Ergo X Harness, Durable and Lightweight Fabrics, UltrAcool System

ErgoFit, On-The-Go Pockets, Distributed Weight, UltrAcool System, MaxO2 System, Durable and Light Weight Fabrics

ErgoFit, On-The-Go Pockets, Durable and Lightweight Fabrics, Distributed Weight, Max02 System, UltrAcool System
  • 100% Nylon
  • Ergo X Harness - This vest features our patented Ergo X Harness which is an over-the-head securing system that places capacity on the body’s natural load bearing positions and keeps the soft tissue areas free from restriction.
  • Max02 Waist - The Nucleus utilizes the Max02 Waist closure system which provides an incredible fit with easy adjustment, but also allows for an uninterrupted natural breathing pattern.
  • Durable and Lightweight Fabrics - The bottom of this compartment has been reinforced with a dual layer of nylon at the stress point for durability. This pack features the UltrAcool Light Mesh for added durability and breathability. Weight: 7.2 oz (204g) with bottle, 4.8 oz (136g) without bottle.
  • Sweatproof Webbing and Water Resistant - Silicone and PU coated feather-weight nylon fabrics resist water, abrasion, and tears. It won’t absorb water or get saturated and heavy.
  • Comfortable - Plush feeling micro-fiber polyester edges, soft and non-abrasive against skin and clothing. Soft perimeter binding keeps contact with the skin comfortable during long runs.

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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