Reusable Coffee Cup KeepCup Thermal is a heat-insulating version of the classic KeepCup. Like the original, it is stylish, practical and an ecological alternative for single-use plastic and paper cups. In addition, it will keep your drinks warm even in the heart of winter. INFORMATION KeepCup Thermal is made out of 18/8 food grade, electropolished stainless steel so it won't add any side-tastes to your drink. The top is made of toxin-free Polypropylene alloy and the plug of LDPE #4 -plastic. All the parts are BPA/BPS -free.