TerramarMen's Thermasilk Filament Crew

These things are great, and I don't understand any criticism on how they wear.These are not meant to be the only under layer for anyone who is active. They are silk, which is very strong, but on the other hand, they are silk, which is always very thin. I've worn and washed mine several times now with no stretching, no running and no snags. I put them in a bag before I add them to the laundry. I got that tip from another reviewer, and it may be why they are still perfect.For an old guy like me who just wants a little extra warmth when I walk my dog, weed my garden, or lock myself out of my house, these are fine as my only under layer. For a bricklayer, a cowboy, a lineman, or a more active person, you might be better off with regular long johns as your first under layer and add these when it gets colder.Some comments talk about lack of warmth, but you will only get a little more warmth (they are really thin) when there is no wind (they are really thin.) (It bears repeating.) If your top layer is windproof, you will notice the extra warmth even in a wind. If your top layer is not windproof, don't expect the wind to be slowed down with this top. It's not made for that purpose. But on a still day, you can definitely tell a difference in warmth when you wear these with any outer layer.So no great warmth and no protection from the wind. Where is the benefit? This is your bottom layer. It pulls the sweat from your body and keeps you dry. That is its main job, and it does it well. The extra warmth is just a bonus. On the coldest of days, I'll have my silkies, my long johns, a heavy shirt, a coat, and a vest. The silkies are just there to keep me dry. The other layers keep me warm.Another bonus for me is that wearing these to bed does not feel constrictive. They are very light and they are stretchy. I normally don't wear anything to bed because I hate when you turn over and your clothes bind and you have to readjust. With these, I wear them to bed and don't notice them.I'll be buying these until they stop selling them.

I have 3 so far I love these so much. I want to buy even more. They make a great underlayer, adding a surprising amount of warmth, for minimal weight and bulk. You'll forget you have them on. They feel super good against my skin. Unlike things like polypro underwear, I don't overheat and sweat in these. I wear them to bed, underneath other layers when hiking, and whenever I want an extra layer of warmth. They are very thin, and you might think they will be flimsy and not last... not at all the case, at least in my experience. They keep their shape too. I've put them through some tough trials too. I have yet to have one wear out on me. I send them through the washer and dryer with everything else. I bought both the men's and women's versions (same brand). In men's I need a size smaller that what I take in women's. The design is different, and the fabric used for the men's (this product) is thicker and a different knit pattern. I like the men's much, much better. So although the women's has held up just as well, I won't replace them. I'll just buy more of the men's design.

I give it 4 stars, but only because I bought it "off season" when the price was *much* lower than it's been since mid-Fall. (That may explain the discrepancy between some of the reviews, too, since most reviewers don't mention what they paid for it.) Mine was about ten bucks, in mid-September. It's easily worth that price. I bought one to try and left the item in the "Saved for Later" part of Amazon's shopping cart to buy more if I liked it, but by the time I'd thought to order more, the price had shot WAY up. (The same thing was true for the glove liners I bought, and the long johns I unfortunately did not buy the first time around.)As always, silk is *much* warmer than cotton and warmer than most wool, but that's as measured *by weight*. This undershirt is warmer than a currently-common thin cotton undershirt, but no warmer than a heavier cotton T-shirt. But is IS much thinner and more comfortable. I especially like wearing it under a thinner pullover, where it provides adequate protection (for both my skin and the sweater) and a little extra warmth without visible bulk. (I do wish they made them with a V-neck, though, since the collar is a tad high and tends to show around the neck of many of my sweaters.) The wrist cuffs are a bit on the loose side, but that's pretty typical of pure silk and I've always found this a common problem with long-sleeved silk undershirts, the fiber just isn't as springy as cotton and some types of wool. A little lycra in the cuffs would be nice, but seriously, I wouldn't expect that sort of touch in anything but a very expensive shirt - WIntersilks don't have it either. But at full price ($20s), I won't be buying more. (If/when prices go back down next Spring, I will stock up, however.)I don't own any recent-vintage Wintersilks, so I don't know how they're making *them* these days - the few pieces I have are all more than 20 years old. (Living in NYC where it very rarely gets "bitterly" cold, I just don't have all that much use for them, though I have worn them regularly, if not frequently, every Winter for all that time.) To be fair, not all of my Wintersilks have surived that long, but a few have, and I don't take special care of them. They go in the warm/color wash and get dried in the drier. I very seriously doubt, on the other hand, that this shirt will last 5 years, much less 20. And since I can't be bothered with things like "lingerie bags" for the washer, am very unlikely to risk putting these through a regular wash cycle along with my other clothes. The fabric isn't terrible. It's not so much that the yarn seems much thinner than other silk undergarments', but the knit is definitely looser.