These are very nice boxer briefs. I was experimenting with some different underwear, and I decided to try some trunks. Turns out trunks aren't really for me; the are a little too short in the legs for my liking, and they tend to ride up a little bit, but they are still very good underwear. I will probably  eventually buy some more P4 Strecth boxer briefs, but I will just get the normal length, not the trunks.
If you are looking for inexpensive (but still good quality) trunks that don't loosen throughout the day and feel like boxers, these are worth a try.