I got a couple pair of these to wear in Korea. I was outside quite a bit and wore these under jeans. I was quite surprised and pleased. They helped a lot. Outside air temp was in the 10-30 degree F range with wind chill going below zero frequently. My legs stayed warm and I didn't have to worry about wearing loose pants to fit over bulky underwear. These fit under my regular jeans. The biggest hassle with these is they have to be hand washed and hung to dry. Not a big deal though since they dry really fast.