Finnish M91 boxers, unissued
For some reason the Finnish army got rid of the Real Men's size underwear. These are made for rough use involving anything from sweat and piss to blood and barbed wire. Well, almost.
Essentially a proper pair of boxer shorts - made of 50/50 polycotton with somewhat airy weave, permit all kinds of movement and have the army property stamps.
Like in the army, there are only well-fitting and extremely well-fitting sizes. The sizes follow the euro system.
Unissued, straight from the manufacturer's cardboard boxes.