Smartwool SW0SW131-410-L men's trekking heavy crew socks is offered, in a large size navy U.S. 70% merino wool, 29% nylon, 1% elastane. This heavy crew sock with heavy full-cushioning provides shock absorption, offers insulation against the elements, and supports under weighty loads. Smartwool SW0SW131-410-L also features an elasticized arch brace holds the sock in place and adds additional support. The Smartwool SW0SW131-410-L socks are brand new in its original packaging and is backed by a 2 year manufacturer's limited warranty.