The adidas Terrex HEAT.RDY Trail Running Speed ankle socks are designed for trail running. They are made from recycled polyester, recycled polyamide, and elastane, providing breathability and lightweight comfort. The socks feature mesh zones for added ventilation and Formotion technology for a perfect fit. They also have anti-blister yarn and padded ankle lines to prevent friction and keep your feet cool and comfortable during long runs. These socks are durable and lightweight, making them ideal for navigating challenging terrain.