Smartwool Men's Microweight Boxer Brief wool Men's sizes: Small = 29-31" waist 36-38" hip. Medium = 32-34" waist 39-41" hip. Large = 35-37" waist 42-44" hip. X-Large = 38-40" waist 45-48" hip. XX-Large = 41-44" waist 49-51" hip. Mid rise, sits at the high hip. 96% merino wool, 4% elastane. Microweight wool jersey knit, UPF 50+ Flatlock internal seams for exceptional comfort and smoothness. Fully functional fly with contrast color bartacks at fly opening. Smooth embossed logo elastic waistband.