NWT Kate Spade Miss to Mrs Bride 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.