Label says machine wash cold (I don't think the website mentions it). Of course, the shirt is 100 percent cotton, so it's likely to shrink if washed in warm or hot water, although a pre-shrinkage is advertised (so why wash cold?). I would put it closer to medium than the large I ordered (I'm 5ft 8" and not fat). The collar is much wider than you might think from the picture, looks a bit defiant. The material is thin which I like as it helps keep me cool in my humid climate which is the main reason I bought the shirt in the first place. While the front button plackets don't match (which I knew before buying), pocket matches Overall, this is a decent shirt for around $22; I gave three stars because one of the buttons almost fell off when the shirt was delivered. I had to sew it back on so I wouldn't lose it the first time I put it on.**EDIT** Upgrading my rating to one star. After washing, this shirt has deformed and is difficult to wear. i give it back I also bought another shirt from the same manufacturer and after 10 minutes a button fell off. wear - the same problem as with this shirt. Stay away from Palm Wave shirts.
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