Made with 90% certified post-consumer recycled 18/8 stainless steel. TK Closure internal thread design improves thermal performance and is compatible with TKWide caps. Climate Lock technology keeps contents cold for up to 33 hours. Chip-resistant Klean Coat powder coat finish (Brushed Stainless is uncoated). BPA and lead free. Slim design fits most cup holders. Includes leak proof twist cap, with built-in reusable steel straw (compatible with 12 oz size). Not recommended for very hot liquids due to the steel straw. Backed by Strong as Steel Limited Lifetime Warranty. Will not retain or transfer flavors.