Description 100% Waterproof Protection: Rubber is naturally waterproof and with our proven formulas, our rubber remains durable and waterproof year after year. Ozone & Tear Resistant Rubber: Built with more natural rubber than most other boots, our hand-laid rubber remains durable and waterproof year after year. Our ZXT rubber is specially formulated to be ozone and tear resistant for added protection. Adjustable Top Strap: Customizable for a secure fit around your calf. Ankle Fit: Our revolutionary fit ensures a secure and comfortable fit around your ankles, while gripping the top of your foot and locking your heel in place.