Thin construction to uniquely maximize air flow and provide a cooling sensation to your feet. High cushioned sole for better performance and a high heel tab to stop slipping into your shoe. Durable and comfortable while offering blister protection and cushioned support. Moisture-wicking and maximizes air flow which allows the foot to breathe during movement. Perfect for runners, athletes, or any active lifestyle being lightweight, cooling, and protective. We recommend washing cold on gentle and tumble dry on low heat. No bleach or fabric softener. Breakthrough product specifically designed for comfort, fit, protection and breathability. OS1st TA4 Thin AirTM Performance Socks feature never before applied technology to keep your feet cool and protected during any activity. Created using 200n medical grade machinery and materials we are able to build in comfort, durability and blister protection, yet with the thinnest upper foot profile ever made. The "Thin SkinTM" construction with uniquely positioned lift-bars, maximizes air-flow achieving a cooling sensation to your feet. Our OS1st manufacturing technology has been leveraged to create the most unique performance socks ever! Maintaining an active lifestyle requires products that fit your daily schedule and can help keep up with your active pace. OS1st Socks with Purpose are designed for just that reason. The OS1st TA4 Thin AirTM Performance Socks were strategically designed to be the world’s thinnest running socks without compromising fit and feel. Still providing OS1st’s standard of quality, the thin air performance socks have a high performance cushioned sole providing a blister free experience. These patent pending socks are made with all the best features you normally find in your favorite running socks…moisture wicking, odor control and blister protection, but now, OS1st has combined those features with our patent pending air movement system design. OS1st TA4 socks are lightweight, cooling and protective.