REUSABLE SPLASH-PROOF LID: Our small straw lid allows you to complete your favorite cup and keep your drink cold. It fits our 355 ml (12 Oz) Mug and 473 ml (16 Oz) Tumbler ENJOY OPTIMAL DRINKING TEMPERATURE FOR HOURS: Enhance your outdoor experience with this flexible straw lid. It features honeycomb insulation that keeps your beverages hot or cold for hours. EASY TO CLEAN: The flexible straw can be detached from the lid for thorough cleaning. To clean the inside of the straw, we recommend our separately available straw cleaning set. HIGH-QUALITY MATERIALS: Whether your day takes you to the beach or the garden, our straw lid is the perfect companion for your favorite cup. SATISFACTION GUARANTEED: We offer a lif etime warranty against manufacturer defects. HYDRO FLASK stands behind our durable and robust materials and is committed to high standards.