Ultraspire UltraFlask 550 Hybrid Bottle Color:Clear Blue on-the-fly access to hydration and

on-the-fly access to hydration and nutrition

XL = Men's 11–12

while the split vent lets you push through your stride without distraction

Blister-free guaranteed

Ultraspire UltraFlask 550 Hybrid Bottle Color:Clear Blue on-the-fly access to hydration andUltrAspire introduces yet another milestone in hydration history: This great feeling, easy stowing 550 mL bottle is a hybrid between a hard bottle and a soft flask! The lightweight super squeezable UltraFlask stands up on its own, is fillable and easy to clean, and has high flow and fast recharge. It is soft, flat and stable against the body and is easily accessed and returned to a vest pocket or a waistpack even when it's empty. The UltraFlask 550