Nathan Soft Flask with ExoSpine 18oz Crazy Compression breathable mesh upper with 3D

breathable mesh upper with 3D printed overlays for support and abrasion resistance

and performance that Rail brings to every stride on the cycling path and every swing on the baseball field

GEL® technology provides comfortable cushioning throughout the day

A black under visor reduces glare

Experience top-tier sun protection with the Noonan long sleeve rash guard

Nathan Soft Flask with ExoSpine 18oz Crazy Compression breathable mesh upper with 3DFlask features Nathan's ExoSpine for structure and stability Bite valve features high flow domed post and blaster compression system that control the water distribution when you use it. Max Fill design with wide flange and 3D bottom shape for more volume in shorter dimension Flexible design shrinks as you drink reducing the movement and easily packs away when empty. Works great with all NATHAN hydration vests, packs, and wide compression belts