These FR shirts look nice enough, and the sleeve cuffs are reasonably comfortable, but apparently the company is staffed by giants. I’m 5’10” with an average build, so can always just buy an M without checking. For these shirts, an S was on the large size, and an M fit me like a sack. I realize it’s an FR shirt, but I’m not wearing it on top of a parka. Since S is the smallest size, my shorter coworkers were stuck either looking at other brands or looking like a kid wearing dad’s shirt.