Vacuum technology is the staple of the Stanley brand, offering vacuum insulation a delivering unsurpassed durability and thermal performance.Vacuum insulation removes air from the gap between steel walls, sealing the vacuum in. This effectively removes the conductive path for heat loss and is a far superior form of insulation, providing thermal retention with minimal bulk. Radiant heat loss is also controlled with a copper coating on the liner.Features:*Thermal lid*Push button lid to open/close with one hand*18/8 stainless steel*Dishwasher safe lid*Leak proof and fully packable*473ml