XLab Hydroblade Front Hydration System fits between the arms of aero bars to allow hands-free drinking. Simply sip from the straw, keeping your eyes on the road ahead. Click cover designed with grippy pull-tab for opening. Simply pop open and refill via Split cap. Insert bottle nozzle into aperture for fast, quick refill. System also includes highly-acclaimed classic torpedo clear cap. Wide mouth, quick-fill opening also makes mid-ride refill of tablets or powder a breeze. Bite valve decreases bloating by reducing air intake when sipping. Flat bottom allows bottle to stand upright on counter when filled. Fits 22.2 diameter aerobar extensions, 80-160mm wide and up to 20deg angles.