This unique cap with long flexible tube features a high flow bite valve that will instantly provide fluid, so you can keep your eyes (and focus) on the road ahead. Designed to interchange with the standard caps as another hydration option that makes it easier to drink from flasks.

STAY FOCUSED ON YOUR RUN
36" long flexible tube features a high flow bite valve that will instantly provide fluid, so you can keep your eyes (and focus) on the road ahead.

SIMPLY COMPATIBLE
Fits all 10 oz, 12oz, 18oz, and 20oz Nathan Soft flasks. Designed to interchange with the standard caps as another hydration option that makes it easier to drink from flasks.