High-quality ventilated fabrics are part of a design criterion that includes a pocket in the mesh to accommodate the AirFlex shockproof gel and abrasion-resistant reinforcement above the knee.New longer ultralight sock to improve fit and comfort.AirMesh air vents with breathable fabric, ideal for hot days and long runs.Super thin and lightweight, with AirFlex gel shock protection.Preformed design for optimal fit and functionality.CE tested and certified for impact protection: Knee EN1621-1One size fits all for a perfect fit.Non-slip end with silicone impressions.Protective materials are perforated for ventilation.