I'm 5'10, weigh 180 pounds and usually wear a size small. These shirts seem to shrink a bit so I bought a larger size and it fits me. I would say they are actually larger than M/L, somewhere between too small and too big for me. The sleeves are a bit longer, but I can live with that. The material is very soft and well made. Excellent value for what I get here. I would expect to pay a lot more for the same shirt at a reputable retailer. Love the overall fit and comfort.