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While standing with your arms relaxed at your side, wrap a flexible tape or length of string around your chest at its widest point. The tape should go through your armpits and stay parallel with the floor while taking the measurement.
NOTIFY ME WHEN IN STOCK
The original Momentum’s accessible rear water bottle pockets were a favorite among our athletes. Momentum 3.0 elevates this feature with enhanced Fluidic Holsters that contour more naturally to the body, moving bottles completely out of the arm swing for better comfort and freedom of movement.
A newly integrated guided rail system makes rear bottle access even more intuitive, allowing for easy re-stowing on the move.Built as a minimalist 6-liter vest, the Momentum 3.0 features upgraded UltrAcool mesh for greater breathability, and a new MaxO2 closure system that adjusts both vertically and horizontally using a simple hook design for a fully customizable fit.
Momentum 3.0 also brings expanded storage: the updated outer quick stash pocket is now accessible mid-run, larger side pockets can now fit bottles, and the front bottle pockets feature an elasticized top with shock cord for extra security. The vest is pole quiver compatible on either side and includes an upgraded zippered shoulder pocket.
Available in 3 sizes.Includes x2 UltraFlask 550 Hybrid Bottles.
Sizes:
Measure around the widest part of the chest, if you find you're between sizes we recommend sizing up.
Small : 66cm - 89cm
Medium : 82cm - 96cm
Large : 96cm - 116cm
Details:
Sweat Proof Webbing—won’t absorb water or get saturated and heavy.
Safety stitched bar tack on all stress points.
An ultralight 230g weight (average)
Zig zagged stitching over elastic for ultra-durability, increased stretch and rebound.
Plush feeling microfiber polyester edges, soft and non-abrasive against skin and clothing.
Magnetic pocket with automatic magnetic closure for rapid access to essentials. Patent pending.
Silicone and PU coated feather-weight nylon fabrics resist water, abrasion and tears.
Lightweight, soft, breathable, but strong, large-holed mesh pulls moisture away from the body to keep skin dry and cool.
As at 1st Feb 2026:
We are currently expecting normal order processing times of one to two days from ordering to shipping.
Orders for the moment, are being processed and shipped within one to four working days of being received. Our expected order delivery schedule is...
This light is lightweight, comfortable and bright!, I used this in a 12 hour night race and could keep the brightness as high as I wanted (because the batteries are cheap and easy to change). It lit the trail well and allowed me to run at my pace (did not need to slow down for visibility).
Mike Hefti
★★★★★
Zygos V4.0
This vest is AMAZING!! I’ve had many vests over the years but this one beats them all, hands down. I love the placement of pockets, materials used and the overall thought of design that will be long lasting and comfortable at the same time.
Matt Ozanic
★★★★★
Nucleus Vest
Love the design with easy front bottle and phone access. I am short with short arms and love that it’s just an easy grab upfront and super easy to put back in place. Love the magnetic pickers for key fob and nutrition. Such an innovative design and UltrAspire nailed it.
