135 lbs. 5' 6". Athletic build. The extra small fits me perfectly. I work outside pretty much every day as an engineer overseeing drill rigs and construction and I shred through shirts like nobody's business. I work in Central WA and it's hot most of the time (110F+). These are nice and cool, but still a tear resistant material. It's a happy medium between the true thick material workshirts (which are too hot for the field and extremely hard to find in women's XS in any actual stores) and normal, short sleeve plaid shirts, which don't hold up half as long. The quick dry feature is nice when you do manage to sweat through the material. I really like tie string on the elbow of the sleeves to hold the sleeves up when rolled up. I also think these hold up well to travel. They don't wrinkle easily and there's a nice reinforced layer on the collar that keeps it looking sharp.
I just bought this shirt last week and decided to wear it today. I accidentally dripped warm butter all down the right front of it this morning. So sad! After washing it the stain is GONE! I cannot believe it. I'm going to buy more. Thanks, CARHARTT!!!!