Compressport ProRacing Socks V2.1 - Run Low The PRS V2.1 remains faithful to the original design, offering outstanding comfort, optimal blood circulation and unequalled postural support - The V2.1 also includes new features: a seamless finish, ventilation zones and improved arch support. Seamless and without elastic, these do not compress the calf (with no tourniquet effect), thus relieving pressure at the ankle. New mesh areas around the ankle, the top of the foot and the toes keep the foot feeling light, fresh, dry and cool. Its breathable thanks to these ventilation zones, which help to remove humidity and sweat while also protecting against heat, the risk of overheating, blisters and fungal infections. Positioned on the plantar arch, the elastic compression band has several benefits: Activation of blood circulation, Postural reinforcement while walking/running, Optimal arch support. Shorter than the previous low-cut socks, these are practically invisible inside the shoe. Thanks to the rear tab the sock remains perfectly in place during exercise and provides protection for the Achilles tendon.