Watertight seals throughout bottle, the lock ring prevents the bottle from accidentally opening and effectively prevents leaks. Material:Bottle (silica gel) cap (plastic)FDA approved silicone friendly reusable water bottle cup safe for kids and adults. Safe for both cold and hot beverages, No burning, no melting. But we do not recommend using it for liquid temperatures higher than 140F to avoid burning your hand while holding it. With soft silicone body, the collapsible sports water bottle is easy to fold up when empty, saving a lot of space, you can put it in small backpack when folded, which is suitable for Sports Fitness, such as training in gym, camping, traveling, biking, hiking and climbing etc. Dear customer, thank you for purchasing our productsI wish you a good day, a good life and a safe life, cordial greetings, sincere blessings, my best regards Why are you choose them? Health Materials: The collapsible travel cup made of food grades silicone, no smell, non-stick and keep your health. Space Saving: with the collapsible design, never take up your space. Inside Measuring Design: Easy to read with the measuring inside of the cup. PE Dust Lid: The tight and snugly fitting lids can prevent any dust and dist from the air. Portable Hook and Connective Hand Rope: Combination of both can string the cup and dust cover together to prevent accidental drop. Stainless Steel Cup Rim: The stainless steel rim at the top is strong and maintains the integrity of the collapsible cup, make the cup much easier to hold and drink. Easy to Clean: With the inner wall adopts smooth design, not easy to be sticky and just wash it under the running water(dishwasher safe). leak-proof design to prevent annoying spills. Hygienic spout cover keeps out grime and germs. mouth makes it easy to clean. Rolls up for easy and convenient storage that saves space. Can be used as a hot or cold compress, this bottle is freezer friendly. This bottle can be used or stored in low and high temperatures. Material: Bottle (silica gel) cap (plastic),Food Grade BPA-free Silicone Color:Blue Size: 7.5*7.5*25.5cm(unfolded) Capacity:500mL (unfolded); Package included:1 X Collapsible Water Bottle