I am 5-10 years old, weigh 170 pounds, have a 40" bust and usually choose a slim fitting shirt. Based on my experience with the short sleeve Naviskin version of this shirt, I ordered a size S and it fits. The sleeves are a bit short on my 33-34 inch arms, but I would have preferred the cuffs to end half an inch below my wrist to keep my hands free. The shirt fits well and doesn't baggy under the armpits or around the tail of the shirt like I've experienced with other brands. Quality lightweight material - although not as soft as the Columbia version, stitching throughout, collar can be buttoned up or left open, subtle logo on the front chest doesn't stand out, buffing fabric on the front of the shirt is comfortable to wear with the touch overall excellent value for money in form and function.
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