A good all-purpose three-season outdoor Smartwool sock designed for rugged day hikes or lightweight backpacking. Arch brace holds the sock in place and adds additional support. Flat-knit toe seam keeps you comfortable. Features: Smart - Wool Fit System Superior moisture wicking properties. Strong Durable construction and materials. WOW Technology in reinforced sole for maximum comfort and durability. 3 x 1 ribbed leg. Sizing clearly indicated on the sock. Flat knit toe seam Elasticized arch braceSmartWool Fit System - The original Smart - Wool Fit System provides a great fit with two supportive bands around the arch and ankle of the sock. WOW Technology: WOW (Wool on Wool) Technology provides high-density cushioning under heel and forefoot that protects against shock and abrasion; lower-density cushioning under arch and around. Achilles reduces weight without sacrificing fit or support.