Nathan Sports 20oz Soft Flask Size:N/A Enjoy increased energy return with

Enjoy increased energy return with every step

The full-zip front allows for wearing open or closed

X-SYNC tall square teeth edges engage the chain earlier than traditional triangle shaped teeth

Created in 1971 for tennis star Stan Smith

CON4M® allows you to customize the shin length for your stance

Nathan Sports 20oz Soft Flask Size:N/A Enjoy increased energy return withOur easiest, convenient 20oz soft flask yet! Perfect to hold by hand on a run, slip into a front vest pocket or stashed on your back. With the bite top, you can make sure that you have control of where your water or liquids go straight into your mouth and not dripping out the top. Bite valve keeps liquid from escaping,Works great with ALL NATHAN hydration vests,Capacity: 20oz 591mL Estimated to ship in 5 7 business days.