" Mens sizes Small 29-31 waist 36-38 chest Medium 32-34 waist 39-41 chest Large 35-37 waist 42-44 chest X-Large 38-40 waist 45-48 chest XX-Large 41-44 waist 49-51 chestbr 100 merino wool interlock knit UPF 50 Machine wash cold tumble dry lowbr Comfortable next to the skin and offering the worlds most efficient moisture-management system Crew neck with set-in long sleeves Shoulder panels eliminate top shoulder seams Flatlock seam construction eliminates chafing br Smartwool Men's Midweight Crew Black size L"