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

4.7 (4) Write Review
Free shipping on orders over $29.99

$42.93

$ 22 .99 $22.99

In Stock

About this item

  • Mesh,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.


Product Description

ultraspire Nucleus vest race hydration running info
ultraspire nucleus running race hydration vest
ultraspire nucleus running hydration vest race harness small footprint shoulder straps
ultraspire nucleus hydration running vest pockets magnetic max 02 sternum
ultraspire nucleus size chart sizes measurement guide
ultraspire history
Customer Reviews
4.8 out of 5 stars 9
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4.4 out of 5 stars 47
Price — — — $53.17
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

Gena S.
2025-08-06 14:57:30
Used this on my first half marathon and it was just what I needed! Comfortable and carried all my gels and a water bottle!
David Wild
2025-05-20 17:59:22
I received vest quickly as advertised. I recommend this light weight vest for any runners.
Customer
2025-05-16 15:54:56
I like this fit shorter runs. Make sure you fit it tight to your chest, otherwise it will bounce and you’ll hear the water sloshing. Very lightweight and good even for us well endowed ladies
Pamela Whiteley
2024-12-30 15:49:56
I bought this on the website but wanted to mention it here. This is perfect for chesty women. The bottle sits on the sternum, not on the girls. Love it!