Tervis stainless steel tumblers feature triple insulation and reduce condensation 20oz tumbler includes leak resistant easy-close hammer lid and keeps drinks hot for up to 8 hours or cold for up to 24 hours (use caution with hot liquids). 17oz slim bottle includes a leak proof insulated lid and keeps drinks cold for up to 48 hours. Copper-lined 18/8 stainless steel construction is durable and material won't retain tastes or odors Stainless steel tumblers and bottles feature a limited 5-year guarantee are designed in Venice FL and Made in China. For best results hand wash with soap water and a scratch-free sponge. Towel try immediately to help preserve decoration. Do not soak or use cleaning materials (bleach chlorine etc.) and do not put in dishwasher freezer or microwave.