Product material/temperature resistance: Food-grade silicone that's BPA-free, non-toxic and odourless. It can withstand extreme temperatures from -40°C (-40°F) to 200°C (392°F). This means you can use it to make hot water. We recommend that the water temperature does not exceed 80°C (176°F) to avoid burns. It can also be frozen. How to use the product:When first used, soak in boiling water for 10 minutes to clean. After cleaning, store in a dry place and avoid direct sunlight. It is recommended to wash immediately after each use. Dishwasher safe. Leak-proof cap at the mouth:Don't worry about water spillage, please be careful to tighten the cap of the bottle after filling it with water. Flexible and travel-friendly design: Fold it up after use to save space 70% in your bag or pocket, and the handle design is easier to carry, carabiner included. Care instructions of the collapsible water bottles: 1. When not in use, clean the product and store in a dry place out of direct sunlight. 2. Keep away from sharp objects to prevent damage. Please replace it in time after poking 3. Do not place near a high temperature fire source.