The wait is over — the Zygos 6.0 race vest from UltrAspire has officially arrived. Since the launch of the original Zygos, tens of thousands of endurance athletes have trusted it as their go-to high-capacity vest, and the newest version is built to elevate that legacy even further.
Designed specifically for the demands of ultra and 200+ mile distances, the Zygos 6.0 is the premium race vest for runners who refuse to compromise. It features a spacious 14-liter capacity with a lightweight, wrap-around design that hugs the body for unmatched comfort and stability. The ErgoFit Harness ensures the pack moves with you, keeping every stride natural and hindrance-free.
Featured on the Zygos 6.0 is the MaxO2 Form adjustable closure system, a next-generation innovation that allows the vest to conform precisely to your body with a single pull, securing your load while still allowing unrestricted breathing. Whether you’re facing steep climbs, technical descents, or grueling miles through the night, the Zygos adapts with you.
With 12 total pockets — 10 of them accessible without breaking stride — this vest redefines what access and efficiency should feel like on the trail. The main back compartment is now reinforced with XT fabric, featuring ripstop fibers stronger than steel for ultimate durability under extreme conditions.
Other upgrades include pole quiver compatibility for effortless trekking pole management, the inclusion of two 800mL SoftFlasks with easy front access, with continued compatibility with up to a 2-liter reservoir for customizable hydration setups. The Zygos 6.0 is available in three sizes to ensure your perfect fit: Small (32″–37″), Medium (35″–40″), and Large (40″–45″).
Whether you’re preparing for your first 100-miler or stacking finish lines at 200+ mile events, the Zygos 6.0 is built to dominate. Trusted by the toughest runners on the planet, it is not just another race vest — it is the ultimate weapon for endurance athletes who demand the best.