The 2 Season Walk Sock from 1000 Mile has been specifically designed for use in warm conditions. The light Coolmax fabric wicks away moisture & enhances air flow to keep the feet cool whilst venting on the upper mid-foot area allows the foot to breathe. The padded heel extends to cover the Achilles tendon with additional padded zones to cushion the ankle bone, toe box & upper mid-foot. The Flat toe seam minimises rubbing & arch bracing helps to provide a customised fit. This product contains Coolmax. Coolmax fabrics are engineered to produce high-performance socks that are soft, breathable & moisture wicking. They draw moisture away from the skin & spread it out across the fabric to enhance evaporation & fast drying. Fresh air moves in to keep your feet cool.