🌟Medium 32-40OZ BOOT：ONLY FIT for WATER BOTTLE with a bottom diameter between 3.5-3.6 in. Such as fit for Hydro Flask 32 oz, 40 oz wide mouth bottles. fit for HYDRO CELL 32 oz, 40 oz. fit for SIM 32 oz, 40 oz. fit for IRON FLASK 32 oz, 40 oz. fit for VMINI 32 oz, 40 oz wide mouth bottles（Note: this size is not fit for Stanley tumbler, Not fit for IRON FLASK narrow mouth bottles!）pls do check the flask bottom diameter before ordering to esure corrct size. BETTER PROTECTION: The silicone sleeve helps the water bottle resist the wear and tear of everyday life, falls and fading, your water bottle will always look like brand new! No more embarrassing noises when placing your water bottle on a tabletop. PERSONALIZED APPEARANCE: The silicone boot is available in a variety of colors to match your water bottle and add an element of style, making it unique whether you are engaged in outdoor activities or daily use. SAFE MATERIAL: Protective silicone sleeve is made of food-grade silicone sleeve material, BPA free, children can also use it safely. The soft silicone material can withstand stretching, reuse many times and still maintain good functionality, a must-have accessory for your water bottle/tumbler. HIGH QUALITY AFTER-SALES: If you have any questions about the silicone sleeve you purchased, please contact us at the first time, we will give a satisfactory solution at the first time. Silicone Boot