The Terrex HEAT.RDY Agravic Crew Socks are designed for trail runners who need breathable protection. These socks feature HEAT.RDY technology and anti-blister yarn on the toe area for cool, comfortable long-distance runs in technical terrains. The socks are made with recycled polyester and provide arch support and an inner grip on top. They are lightweight and durable, making them a great choice for intense trail runs. The breathable mesh panels and anti-blister yarn keep feet cool and comfortable over long distances, while padded ankle lines prevent friction.