Because you deserve the best, the durable steel cup stands amongst the very best just for you! It features double wall layer for insulation of its contents which are derived from stainless steel outer and inner layers.This item is BPA free and is FDA approved for usage. This cup is also able to hold hot or cold liquids for extended periods in their optimum condition. NOTE: This cup is not dishwasher compatible and should only be hand washed. 4 1/2" high.