Fit & Design: 4 Degree(TM) Elite Fit System offers a performance fit with strategic stretch and mesh zones to promote breathability while helping protect against blisters Comfort welt with 'stay put' fit Mesh zones for added breathability Strategically placed cushioning for comfort without the bulk Technology: Indestructawool(TM) durability technology is intentionally knit into high impact wear zones, helping your socks outlast your longest adventures Virtually Seamless(TM) toe technology is a flat knit toe seam designed for additional comfort Additional Details: Ankle height Machine Wash Warm, Inside Out; Do Not Dry Clean; Do Not Iron; Tumble Dry Low; Do Not Bleach