Mugzie Flip Flop Time Travel Mug with Insulated Wetsuit Cover, 16 oz, Black 16 Oz Stainless Steel Travel Mug covered with water-proof, neoprene wetsuit material Hand-sewn fabric cover is made from 1/4 inch closed-cell neoprene that is covered with soft, water-proof polyester fabric Stain-resistant cover is printed in hi-resolution and has full-wrap coverage. Spill resistant lid and a non-skid bottom Cushioned cover affords a secure grip and eliminates condensation and sweating. Fits in most car cup holders and the counter-weighted bottom provides stability. Bottom diameter is 2 3/4 Inch Patented. Truly unique. Made in the USA