Balega Limited Edition London Marathon Running Socks are constructed with ultrafine hi-tech performance yarns and feature a protection-based design to create the sheerest, lightest performance no show running sock. Engineered with proprietary Drynamix moisture management technology, the socks will keep your feet cool and dry, while allowing free airflow for maximum comfort, performance, and durability. The hand crafted, high performance Limited Edition Running Socks are lightweight and thinner than most other running socks to provide a true minimalist feel. Race-tested and incorporating a hand-linked seamless toe to eliminate abrasion across the top of the foot, these socks provide the ultimate comfort without adding bulk to your shoe. An extra deep heel pocket ensures the sock fits your foot perfectly and won't slide down during activity. Features Constructed with ultrafine high-tech performance yarns to create the sheerest, lightest performance no show running sock Reinforced microfiber toe and heel along with unique heel design creates a more formed, extra-deep heel pocket Proprietary Drynamix moisture wicking fibers keep feet cool and dry, and features reinforced microfiber mesh ventilations panels Hand-linked, seamless reinforced toe maximizes comfort, high heel tab helps prevent sock from slipping and minimizes exposure to blisters Each sock is hand-inspected for quality insurance. One-year warranty