Kamik Lucas Lo100% waterproof.Vulcanized rubber upper.Waterproof 4-way stretch neoprene collar creates an easy slip-on/off silhouette. Removable felt liner helps wick away moisture while keeping feet warm.Antibacterial Kamik® comfort EVA footbed provides long-wear comfort. Vulcanized LAWN rubber outsole.Kamik® Rated: -25°F/-32°CMeasurements:Weight: 1 lb 1 ozProduct measurements were taken using size 9. Please note that measurements may vary by size.