Construction: best in class Thermo 3D Double Wall vacuum insulation eliminates condensation and keeps tea and coffee hot & Beer and other drinks cold. Hard-shell powder Coating on colored tumblers adds grip and protects & preserves your product. Materials: High quality 18/8 Medical grade stainless steel is safe & strong and won’t transfer flavor or leave a metallic aftertaste. All Mir products are to be 100% BPA free. Hand wash recommended for long-term product Satisfaction. Lid: you’ll love our press fit lid, engineered for durability and designed to retain temperature longer & prevent splashing. Top rack dishwasher safe. Size: compatible with most cup holders to keep your drink locked and in an upright position as you navigate life’s wild ride. Product to project: every Mir product Sold helps fund trackable giving projects. Register your give Code to experience the story behind your purchase. All Mir products come with a limited lifetime against manufacturer defects.