Colorful protection. Make your Hydro Flask your own with a colorful, durable silicone Flex Boot. Customize your look and protect against bumps and dings.nnProduct Benefitsn- Removable, silicone boot adds extra protection to your Hydro Flaskn- Medium boot fits 32 and 40 oz wide mouth bottlesn- Medium boot is not compatible with 32 oz Lightweight Wide Mouth Trail Series bottlesn- BPA-Freen- Lifetime Warranty