Stainless steel and cupholder compatible, the reusable, refillable 21 oz Standard Mouth insulated water bottle keeps cold drinks cold for 24 hours, hot drinks hot for up to 12 hours, and holds enough hydration for hours of fun. 24 hours cold, 12 hours hot TempShieldA(R) double-wall vacuum insulation Leakproof when closed Pure taste, no flavor transfer Durable stainless steel Fits most cupholders BPA-Free Dishwasher safe Not for use on a stove, in a microwave or freezer Keep hot liquids out of the reach of children