SIGG Active Bottle Tops are dirt-proof, leak-proof and easy to drink from. Innovative design allows you to drink without ever touching the mouthpiece with your fingers. Dirt-proof, leak-proof and BPA free. Automatic mouthpiece for one-hand maneuvering. Made from 100% food-safe polypropylene. Active Bottle Tops fit any sized SIGG reusable bottle, allowing you to customize your SIGG for easier drinking and with a variety of colors. Sports-style spouts make it easy drinking on the go – ideal for sports and other activities. Also, as one of the few leak-proof sports-style spouts for metal bottles, you can feel safe throwing this into a backpack.