Nathan IceSpeed Insulated Handheld 18oz Hydration Belts & Water Bottles : The Nathan IceSpeed Insulated Handheld 18oz. will help prevent your water and other fluids from freezing thanks to the double-wall insulated SpeedDraw flask and IceCutter(TM) Cap. You wont have to stray away from cold weather with a hand-warmer pocket that will provide much-appreciated warmth. Reflective trim enhances visibility. Dishwasher-safe on the top rack. BPA-free.