Y.VN 24oz. Double Wall Gel Freezer Mug 24-Ounce Capacity,One cup. Eliminates the need for ice as the technology keeps drinks "crushed ice" cold for hours without the watered down affect of ice. By placing these handy acrylic mugs into your freezer for about two hours (they work best when placed upside-down) the freezer gel freezes, offering you a unique way to keep your beverage icy cold. Filled with non toxic, refreezable crystals, BPA free, Requires hand washing for care. 100% CUSTOMER SATISFACTION GUARANTEE - Order with confidence! The Decodyne? 100% customer satisfaction guarantee means that we will fix any problems and to your 100% satisfaction! We are always available to help our customers. Our customer service record is unmatched!