Features

1. Double-wall construction and open cell foam technology create a barrier – slowing the heat transfer from the user to the hydration
2. Soft material conforms to most hydration vests, belts, or pack pockets, makes a great addition or replacement running flask
3. Vest-pack fit provides bounce-free stability and a flexible flask shoulder to prevent chafing so you can focus on FKT's and PR's
4. High-flow bite valve auto-seals after each sip, eliminating annoying drips
5. Large standard 42mm opening lets you fill the UltraFlask IT easily with ice and drink mixes
6. Customize your cap with two options depending on your run or vest, directly mount your bite valve or use the straw cap (which can be cut to any length)
7. Made of ultra-durable, abrasion resistant TPU & RF welded seams for superior durability and elasticity
8. 100% BPA & PVC free, wide working temperature range (can be frozen - max temp 60° C / 140° F)