Nathan SpeedDraw Plus Insulated 18oz Hydration Belts & Water Bottles Astral Aura/Majesty/Blue Radiance : The Ergonomical(TM) Nathan SpeedDraw Plus Insulated 18 oz Flask allows for the most natural grip possible and easy-squeeze access to hydration. The insulation makes this the first-ever double-wall flask and will help keep your liquids cooler for much longer. A fully adjustable hand strap with thumbhole enables grip-free running. Race Cap offers quick bursts of fluid. Integrated, internal reflective fabric offers 360-degree reflectivity for optimum visibility. Fire & Ice(TM) technology allows for the most natural grip possible and easy-squeeze access to fluids. Large, expandable zippered pocket carries phone, keys, ID, and other running essentials. BPA-free.