Stockpile 4005 - SpinFX Boot Sock As spinifex stabilises dunes along the coast of Australia, the Stockpile SpinFX Boot Sock adds unmatched reinforcement and comfort to your feet. Regardless of your daily mission and location, this sock will keep your soles feeling relaxed and comfortable all day. 85% wool yarn, 15% blend of cotton, nylon and elastane Reinforced heel and toe Stretch top design allows for greater circulation Machine washable 100% Australian made Stockpile Spinfx Boot Sock