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Double-layer vacuum insulation technology can keep your favorite drinks warm, cold or iced for several hours. The rotating cover on this stainless steel flat-bottomed cup allows you to choose the opening of the straw, the wide mouth and the top of the full cover to prevent overflow. Take it with you to your favorite studio for exercise, commuting, or make it your desk companion - just choose your cup size to go out all day to replenish water..syi