Your 20s are about letting loose while still growing up. We thought hard about both aspects while rounding up our favorite 20-something underwear brands.

Pop quiz: What brand introduced the boxer short to the UK in the 1950s? What brand made the famous Riviera polo that was worn by Daniel Craig in the James Bond film ‘Casino Royale’? What brand is the second biggest selling men’s underwear brand at the Selfridges department chain throughout the UK (second to Calvin Klein)? Pencils down. The answer, after the jump.