these help me from chaffing. I wear them under my skirt at the gym so that way my thunder thighs don't create a front and rub me raw...Literally. They are a smidge tight and are a polyester/cotton mix so not spandex if that is what you are looking for. Originally that was what I had wanted. I love these a lot and was pleasantly surprised with them. The fit is true to size or maybe a smidge too tight depending on how you enjoy the fit of your clothing.