NWT Kate Spade Bridesmaid Tumbler Cup DOUBLE WALL INSULATION is only suitable for cold beverages. Insulated double wall design keeps contents cool and your cup rid of condensation. EASY CARE: For best care, the tumbler cup and lid should only be washed by hand. This reusable cup cannot be used in the microwave. SAFE MATERIALS - 20 oz tumbler is made of acrylic that is BPA, lead, and phthalate-free