1.EASY TO DRINK & CARRY - Spout lid allows maximum water flow and easy one-handed drinking. Better sealing effect with screw / twist cap, LEAK PROOF. Twist the cap which allows you to drink without removing the lid and seal beverage with confidence. 2.MULTI-COMPATIBLE WITH HYDROFLASK WIDE MOUTH - Fits sports water bottle such as WIDE MOUTH Hydro Flask 18 oz 32 oz, 40 oz and theretically fits brands Mira, Takeya, Simply Modern SUMMIT, Fifty/Fifty (FOR WIDE MOUTH TYPES ONLY). One of the most popular lid top hydroflask lid accessories. NOT for every brand wide mouth water bottle.3. PREMIUM MATERIAL - Chug lid made of Premium and Durable BPA Free material which withstands Bite Marks. Safe to be used with hot and cold beverages. Screw the cap tightly and leak-proof, spill-proof.4. BPA FREE & TOXIN FREE - Replacement spout lid cap for hydroflask wide mouth18 oz 32 oz 40 oz, meet daily hydrating on the go, which enables easy drink in a more safe and hygiene way. No ador not affect your taste.