Do all men's swim trunks have netting?
Not all swim trunks come equipped with netting. Board short-style swim trunks, which are cut closer to the body, typically do not. Try on swimwear to ensure a good fit; swim trunk netting that is too tight can cause pain in the groin and netting that is too loose provides little or no support.
Why do swim trunks have pockets?
For swim trunks, there are holes in the pockets to make it easier for you to swim. After all, you're a man, not a buoy. The holes also let any extra water flow away without the need to invert your pockets.