I am 6ft 3" and 175 lbs. I have long arms and long sleeve shirts fit me not very well. But this one definitely did. I'm not ridiculously skinny, but I'm not very broad-shouldered either. I bought a large one to be on the safe side, I'm usually medium for most shirts. It breathes great and is very comfortable. I'm a welder. And I use it at work. Surprisingly, this shirt has withstood welding sparks and tiny splinters from the damper (grinding) washer very well. Although I'm impressed. And I will continue to buy this product, after this has been crushed or set on fire - I can't avoid it even with flame retardant clothing.
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