Seemed big at first, but after one washing (and tumble-dry-low) it's just right. It's a standard fit (not slim). I'm 5'8" 160 lbs, and the medium fits me nicely with room to move. I also wear slim fits sometimes to be more fashionable, but these give me more room to move and work. It's pretty comfy and seems well made. The collar does curl, but pretty much any cotton shirt is going to do that. I also bought one of their cotton/poly blend shirts (K455LS). It started off seeming like a good fit, and didn't shrink much in the wash. After washing, they both fit the same. I'm shopping for company shirts for an AV Installation company. Right now, I'm leaning toward the K455LS cotton/poly blend. The collar seems to lay slightly better on the blended shirts.