No show silhouette designed to stay hidden in active footwear. Sewn-in binder and internal heel gripper for secure, stay-in-place fit. Indestructawool durability technology is intentionally knit into high impact wear zones, helping your socks outlast your longest adventures. 4 Degree Elite Fit System offers a performance fit with strategic stretch and mesh zones to promote breathability while helping protect against blisters. Virtually Seamless toe technology is a flat knit toe seam designed for additional comfort.