The Thor-Lo™ 84N Runner Sock provides maximum protection at a minimal weight. This sock is clinically confirmed to reduce blisters, pressure and pain. Made for the serious runner, the product eliminates pain and provides top-notch moisture management and foot protection with exclusive THOR-LON® and LYCRA® fabrics. The 84N Runner socks provide protection in key areas so you can keep running without pain. FEATURES: Thor-Lo® socks use Lycra® fiber for contoured fit Lycra® fiber arch/instep for a no-slip fit Maximum cushioning protection to fight blisters and irritation Padding under the ball of the foot and heel maximizes protection and comfort Extra cushioning over the toes protects against runner's toe Reduces friction and irritation in key areas Socks includes spandex fabric for additional support Ventilated sock frame provides contoured aerodynamic fit Made in the USA Recommended Care: Machine wash and dry inside out Thor-Lo SIZE CHART: Sock Size: Medium = Shoe Size: Men’s 5.5-8.5, Women’s 6.5-10 Sock Size: Large = Shoe Size: Men’s 9-12.5, Women’s 10.5-13