SmartWool Mens NTS Midweight Boot Top Bottom 250g 100% Next-To-Skin (NTS) midweight merino wool fabric regulates your body temperature so you stay warm on long chairlift rides and cool when you're working hard in the steeps Merino also resists the build-up of odors so you don't have to deal with stink during hut trips or post-shredding drinks in the lodge Boot cut (20in inseam) means you don't have to deal with baselayer-over-the-socks bunching in your boots Flatlock seams help prevent chafing 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.