Altra Stoneguard Shoe Insert, size Medium

Medium Altra Stoneguard Shoe Insert. New. Never used. From Altra: Get underfoot protection on the trail, over rocks, debris, and tough terrain. Slip a removable StoneGuard™ insert into your trail shoes for a stable and soft underfoot feel. For sizing: These fit perfectly in my women's 8.5 Altra running shoes. See pics for measurements.