Why would a man wear fishnet underwear? The answer could either be for comfort or for the look. Fishnet is characterized by fact that it is made with less fabric. There is plenty of room between the fabric strands, making for an undergarment that is lighter in weight and that lets body heat escape. When made of a comfortable material like microfiber for example, fishnet briefs or boxers feel almost like wearing nothing at all.
Some examples:
Clever 2165 – Prague – Men’s Lowrise See Through Mesh Boxer Brief, red
Modus Vivendi 07711 – Sexy C-Through Mesh Brief – Red, Yellow, Aqua, Black or White
Clever Mens Mesh Bars Boxer, black
Technically, the term fishnet should be used to describe a fabric with a rather large holes, just like a real fishing net would have.