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These jammers are great. I am a female and I brought these to wear under my boy-leg, one-piece swimsuit. The material has good stretch and they support well. They are a shiny Lycra material and light weight. I have not worn them in water yet, but I washed them and air dried them and they still look new.
Ladies, if you buy these to wear, you must get a size are two larger than you wear, because men's pants/shorts are cut shorter in the crotch than women's. When you buy a man's larger size waist, you will have to take in/sew the waist and maybe the legs, but the fit will be better.
I highly recommend these for the purpose I purchased them for.
I have a stack of these which I wear under my shorts or pants when running and hiking. They resist bunching and chafing much better than conventional underwear. They are quite comfortable, don't slide up or down, etc. Very pleased.