Double-wall vacuum insulation with a narrower bottom to fit most cup holders. Leatherette band is not removable and is very nice! Will not fade or peel! Can be used with optional slide lid LTM20L. Seamless construction. Hole on lid is big enough for a straw. Polar Camels are made from 18/8 gauge stainless steel (18% chromium/8% nickel) - also known as Type 304 Food Grade. Replacement Lid LTMR20.