The Sipper Straw twist-on, leakproof threaded lid pairs seamlessly with a flexible silicone straw and our trusted Wide Mouth Bottle for ultimate convenience and style. Straw Trim Guide: for best fit, trim your straw based on your MiiR bottle size: 12oz: 4.9in / 125mm (including Kids' Bottles)16oz: 6.38in / 162mm Care Wash before use. Hand wash recommended. Not for use with hot beverages. Do not freeze, do not microwave, do not bleach, do not overfill. CAUTION: Choking hazard. May contain small parts not suitable for children under 3 years.