I always wore boxer briefs under trunks because I'm not a fan of shorts with netting or nothing, these fix that issue. I'm generally a 31" waist and I've got a bigger backside and fluctuate between 175 and 188. When I'm having fat days, a large would probably be better but at 180 or less, they're good. If your size is an extra medium and you fight with being between those sizes with shirts and shorts, you'll do that with these. No complaints, that just seems to be the case with the more athletic fit of clothes these days. Guess I need a couple pairs! I had an issue with the color I bought. I thought it was one and when I checked the order it was another. I think I had two in my cart and deleted the wrong one. I sent an email and they had it fixed immediately without any delay. It's tricky to get that kind of response these days!