I'm 5foot 10 inches and weigh 145lb and use the Goodnites XLg. When I go on a sleepova. I wear boxers and nylon running pants ova dem and aint no one been found out I got dem on yet. They is great. If they is wet in the morning I hide dem in my overnight bag. If I'm going right home after we get up and they dry or not to wet I just keep dem on until I get home.