Twist it, sip it, save it. Our new Twist Cap with built-in straw fits all TKWide bottles. Twist open the straw spout to quench your thirst or snap it closed for a completely leakproof lid. The Twist Cap is a dream come true for Klean fans who want both a reusable straw and a leakproof cap. Who says you can’t have it all? Twist Cap is also equipped with new TK Closure™ internal thread design and an easy-swivel loop. Compatible with TKWide Klean Kanteen bottles only. Not recommended for very hot liquids due to steel straw.. Features -. Food-grade 18/8 stainless steel and silicone straw. Cut-to-fit silicone extender for compatibility with all TKWide bottles. Easy to assemble and disassemble. Cap pairs with new TK Closure internal thread design to increase thermal performance. Easy to clean. Replaceable parts available. Easy-carry swivel loop. Off-set straw placement prevents carry loop interference when drinking. Twist cap features a built in straw and easy twist closure for a leakproof seal. Not recommended for very hot liquids due to steel straw