I used to consider a medium size which was too tight in the forearms but at the same time was suitable for a looser fit. This time I knew what to expect and wanted to wear it over a shirt or other base layer. good loose-fitting thermal layer with some neck protection. The collar closes with a lot of space because I wear mediums directly on the skin. A very comfortable 2nd and 3rd layer under a jacket or in less warm rooms, especially when it's drafty, except for a somewhat annoying rubbing at the collar when worn unbuttoned. to a slightly sporty T-frame. If you have more proportions in one area than another, go up a size for a looser fit or switch to another product that stretches more than a wetsuit. As I have a leaner, athletic build, my forearms were smothered in a medium but comfortably tight plus-size fit, with the rest being loose enough for a V-neck, long-sleeved Tesla-mimic t-shirt that was a compression fit represents.
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