The Nathan Trail Mix Plus Insulated hydration belt will become an essential accessory for your mid-distance runs with two 10 ounce flasks that feature push-pull caps. Double-wall insulation helps maintain the optimal temperature of your hydration for the best taste possible. The ergo-shaped, soft monofilament belt offers multi-directional stretch that eliminates bounce and maximizes comfort. Fits up to iPhone 6 Plus. Shock cords feature one-pull tension locks for extra capacity. Fire and Ice™ reflectivity enhances visibility. SpeedFit™ holsters ensure quick, one-handed access. Hand-wash only. BPA- and PVC-free.