Insulated Sports Water Bottle: Goodbye sweat! The double-wall insulation makes the Iron Flask sweat-free! It keeps your drink COLD for up to 24 hours, and HOT for up to 12 hours. NOTE: ONLY the 400ml, 530ml and 650ml fit in cupholders LEAK-PROOF Carabiner Straw Lid: Enjoy spill-free sipping with our best-selling, LEAK-PROOF straw lid. Effortlessly clips onto bags for easy carrying—no spills, ever! 18/8 Premium Stainless Steel: The Iron Flask is made of 18/8 Stainless steel that is BPA free and non-toxic. It will never leave a metal taste or rust. HAND WASH ONLY WITH SOAPY HOT WATER! Functional Design: The powder coat exterior finish is a classic. It assures that you stand out with a very durable and elegant bottle. Our logo is now LASER-ENGRAVED to assure the highest quality as well. The Ultimate Design: Choose a color that speaks to your friends and family! Great for the outdoor or gym enthusiast that will enjoy a memorable product they'll remember, & due to its durability will stand the test of time.