Thank you for viewing! ✅ Silicone cover to prevent the bottom from falling out of your thermal my bottle pouch. It protects the bottom of your bottle pouch. ✅ Comes with double-sided tape that can be washed with water, adhering to the cover and preventing slippage. Installation is very convenient: simply apply the double-sided tape, then put the cover on and press firmly. ✅ Compatible with my bottle pouches sized 350-400ml and 450-600ml. Also suitable for other water bottle covers with a capacity of 350 ml to 600 ml and a diameter of 7 cm. Water bottles and bottles with a bottom diameter of 7 cm can be used directly. ○ Brand new, unused item, but stored at home! Please refrain from purchasing if you are sensitive to this. ○ Opened once for photography. ○ No warranty included‼️ ○ If there are any defects, please contact us before leaving a review‼️ We will not accept inquiries after a review has been left.