S'well Tumblers feature triple-layered, vacuum-insulated construction, designed to keep beverages cold or hot longer. Made from 18/8, food-grade stainless steel with superior construction that allows for refilling and reusing easily to reduce the need for single-use plastic water bottles. Copper wall layer creates a condensation-free exterior that won't sweat on your wooden table or countertop without a coaster. BPA/BPS-Free and reusable. Hand-wash only.