Channeling Mayor Larry Vaughn here a bit... I don't think there are any materials in this shirt that exist in nature... a blend of banlon and imported Italian polyester. Love pockets on s/s shirts or t-shirts.. have to load them up with your wallet, a few scratch tickets and maybe a set of glasses... really test the strength of the stitching.
Whether building sandcastles w/ the young or propping up the bar at The Ritz (Oak Bluffs, MV) this shirt is a serious GP... Purchased to be part of Popeye costume about 10 years ago, and it might be 20 years older than that, it somehow got in my summer rotation haha.