SmartWool Men's Microweight Boxer Brief - Past Season 96% Merino Wool, 4% Elastane Knit in USA of Imported Yarn Coats Seamsoft thread on flatlock internal seamsfor exceptional smoothness and comfort. Form fit - mid rise Jersey knit; UPF 50+. Size M/ inseam:4.75" (12cm) Fully fuctional fly with contrast color bartacks at fly opening Logo elastic waistband with wool terry loop next to skin Style: SW0SN701