The Swiftwick Aspire No Show Socks deliver breathable support and firm compression for running and trail running. Their ultra thin profile creates a lightweight feel while providing a secure fit that stays comfortably in place during every stride. Signature Olefin fibers wick moisture away from the feet to help keep them cool, dry, and blister free. A Y shaped heel creates a snug fit that moves naturally with the foot without bunching or slipping. The no show cuff sits below the ankle and includes a micro tab to help protect the heel from shoe contact. Channeled upper construction increases breathability, while firm compression helps support the feet and reduce fatigue during long runs.