The Compression Mudder socks are designed for trail running and any type of rough terrain walking. With the Porelle membrane laminated between the fabrics, they are waterproof, mudproof, sand proof and sting proof from insects and leeches. Knitted with the seamless toe technology and the graduated compression on the calves, the socks help to push you further in whatever your choice of activities, from Tough Mudder to adventure racing.