Our bottles are not only thoughtfully designed but also of very high quality. We use the best stainless steel on the market: 18/8. The double-walled construction ensures good insulation, keeping drinks cold for up to 10 hours or hot for 5 hours. Keeping warm: ideal for hot water in the bottle, but also great as a thermos for tea or coffee. Be careful not to drink directly to avoid burns. Keeping cold: perfect for outings, sports, or school! Care instructions: - Do not clean in the dishwasher. - Do not use in the microwave. - The bottle can be placed in the refrigerator. - Clean before first use.