These are traditional men's briefs, made of Merino wool. You often see this kind of undies made of cotton, but these woolen briefs are way better and fit nicely, too, without looking too. The front is thicker due to a double layer, as usual with this style of underwear. Unlike cotton, it doesn't mean sweaty dampness even when you are standing still on a hot day. The waist is elastic to keep 'em up. High quality Merino wool Material: 100% merino wool. Weight 190g/m2 / 5.5 oz/yd2. 17.5 micron. Wool wash in 40 degrees Celsius (104 F). Merino wool allows sweat to pass through without soaking, is naturally resistant to stains and odors, and is just right in terms of insulation in most environments. These are a piece of garment you will love to wear all year round - including summer. Mulesing free! All our merino wool products are made using mulesing-free certified merino wool.