I was looking for replacement under pants because the others I have are almost falling apart after over 10 years of wear. These looked like them, the material said the same as my old ones, and so I ordered 7. Even though the size said the same as my old ones, these new ones were uncomfortably too small. And it was like an oven, it held in sweat, and actually made me perspire all the more. So, within 1 hour, I removed them and put another pair on, same thing. Then I put on one of the old pants and I was comfortable..no perspiration, especially under the pants. I cannot figure that out, as both pants say 100% nylon. It must be in the weave. Now I am stuck with 7 pair of underpants that I wished I didn't order.