Irvine Park Men's Light Brown/Beige Short Sleeve Sweater Size Medium

Irvine Park Men's Light Brown/Beige Short Sleeve Sweater Size Medium. 55% acrylic 45% cotton. There are a few loose strings. I'm not for sure if it's a medium or not but it says MED on the tag. There's a few small knot-like areas in the inside. Measurements: Shoulders - 19 5/8" Arms - 10 3/4" Chest - 20 3/4" Length - 28 7/8" Opening - 18" These measurements may not be exact but it's what I got.