I have experience of wearing regular cotton and silk blend long underwear, and I prefer the silk underwear I use, which is actually synthetic for its light weight and freedom of movement. I would classify them as medium. They are more than warm enough to be used in a shop at around 50 degrees. They're a little heavier than I hoped, but still ok. My only complaint is that they don't build up well on my legs where they rub against my pants. The design is good, the material is very elastic. I'm medium height and wear a 32 waist and a 32 length and the medium size fits me perfectly, I'm quite lanky and my arms and legs are more than long enough. I would buy them again. I also tried them as nightwear when they were new as I find it difficult to sleep in clothes and although it does get very cold at times I still can't stand them so I can't recommend them for that.
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