Falke ru4 cushioning running sock allow the falke ru4 cushioning running sock to help you feel better when out on a run with improved comfort and fit the ru4 cushioning provides great all around comfort that really helps to absorb impact while the air channelling and support structures provide further comfort mens running socks falke branding open mesh fabric ventilation air channelling 360 degree protection various cushioned pieces 38 polypropylene 37 polyamide 25