Made with 90% recycled 18/8 stainless steel Thermo 3D ™ Double Wall Vacuum Insulation Technology This camp cup won't sweat no matter the temperature of your drink 18/8 medical grade stainless steel doesn't transfer flavor or leave you with a metal aftertaste in your mouth Hardshell™ Powder coat has great color and prevents peeling Press-fit Straw Lid includes a three-part system with lid, drinking straw, and silicone mouthpiece Hand wash recommended. For best results, wash your MiiR product with a long-handled soft bristle brush, soap, and warm water