Platt Logo Engraved on one Side. Hobbs Logo Engraved on one Side. 29oz tumbler with straw and slide lids. Double-wall vacuum insulation. The mug has a narrower bottom to fit most standard cup holders. It is 2X heat & cold resistant compared to a normal tumblers. Polar Camels are made from 18/8 gauge stainless steel (18% chromium/8% nickel) - also known as Type 304 Food Grade. Handwashing recommended.