【316 Stainless Steel Liner】Compared with 304 stainless steel, 316 medical-grade stainless steel inner features better performance in corrosion resistance, oxidation resistance, rust resistance, temperature retention and water scaling prevention, providing pure taste to the last drop. It’s also BPA-free and non-toxic, giving you worry-free and healthy drinking. 【5-layer Insulation Construction】OMORC 500ml water bottle is made with 316 stainless steel, premium copper coated layer, 304 stainless steel, vacuum insulation and outer powder coat from interior to exterior to reduce the temperature transfer or loss and extend the temperature retention, keeping drinks cold for 48hrs and hot for 24hrs. 【Anti-slip & Anti-leak】The frosted powder coat on the outside wall increases the friction between the hands and the water bottle and provides tighter gripping. The BPA-free rubber seal ring on each cap guarantees leak-proof performance even you tip it over. Safe to store in backpack, schoolbag or travel bag without wetting troubles. 【Straw Lid & Loop Lid】Each vacuum insulated water bottle is equipped with 2 interchangeable food-grade PP lids. Loop cap is easy-to-carry and suitable for drinking hot water. Straw lid offers greater drinking convenience without spill worries or clumsy hassle of removing the loop cap. Ideal for teens, students, boys or girls for home, school and outdoor uses. Note: For better temperature retention effects, loop cap is recommended to use. 【What You Get】Enjoy healthy hydration with this full water bottles set. You will get 1 x Stainless Steel Water Bottle, 1 x Carrying Pouch, 1 x Straw Lid, 1 x Loop Lid, 2 x Straws, 1 x Cup Brush and 1 x Straw Brush. For OMORC vacuum insulated water bottle, you can enjoy Lifetime Service for worry-free experience. If you have any problems, please feel free to contact us.