All THINKSPORT bottles are super insulated to keep the contents cold or hot for hours. It will hold ice for 12 hours! In addition, because of the insulation you won't feel the temperature of the contents even if you hot fill the bottle. All of our bottles also feature a wide mouth opening (for ease of filling and cleaning) and a smaller polypropylene spout (for convenient drinking). How do I care for my THINKSPORT bottle? While we recommend hand washing our bottles, they are dishwasher safe as long as you remove the cap and strap first. When not using our bottle, keep it clean and dry. Double-walled and vacuum-sealed stainless steel - keeps contents hot or cold for hours. Holds contents ice cold for over 12 hours. Perfect of hot or cold beverages - does not sweat (for cold contents) or burn your hand (for hot contents). Contoured design - makes the bottle easy to hold and visually distinctive. Removable mesh filter - keeps ice from blocking the drinking spout and allows users to conveniently brew tea on the go. Unsurpassed testing for material safety - our products undergo rigorous chemical and biologic testing to insure they do not contain toxic chemicals. Free of BPA, phthalates, and PVC All THINKSPORT bottles are made of 18/8 medical- grade stainless steel.