ULTRASPIRE - Nucleus Race Vest (Blue)



The Nucleus is a new addition to the vest lineup and features our Ergo X Harness, which is a patented harness system defined by its distinct shape and fit. The Ergo X Harness keeps the weight and pressure points off of the soft tissue areas resulting in better blood flow and cooling. The front pocket is double layered for added capacity. The back compartment is layered with sweat-proof fabrics to keep contents safe from moisture and sweat. One side features an on-the-go accessible magnetic pocket for items you wish to keep more secure. 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. 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. This vest includes our UltraFlask 550 Hybrid Bottle. One size fits most.


  • Silicone and PU-coated feather-weight nylon fabrics resist water, abrasion, and tears.
  • Lightweight, soft, breathable, but strong mesh pulls moisture away from the body to keep skin dry and cool.
  • 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.
  • Zig-zagged stitching over elastic for ultra-durability increased stretch and rebound.
  • Ergo X Harness.


Fit:  Unisex
Size:  Universal (Chest Size:  26″-48″)
Color options:  Ice Blue
Hydration Compatible: 1x UltraFlask 550 Hybrid Bottle 
Reservoir Compatible: Not Compatible
Capacity: 305 c.i. (5L)
Weight: 7.2 oz (204g) with the bottle, 4.8 oz (136g) without the bottle