Twist it, sip it, save it. Our 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 also equipped with TK Closure™ internal thread design and an easy-swivel loop. Our kit comes with 2 extra steel straws with silicone tips, for different bottle sizes, and a straw cleaning brush. NOTE: Compatible with insulated bottles only (with internal threads). Not suitable for liquids above room temperature. Not intended for hot or carbonated beverages.