Men’s hunter green Nike Golf shirt

Men’s Nike Golf shirt, in good condition. My husband only wore it a few times and now it is too big for him. I did notice on the back there is some darkening of the material, I am not sure if this is a manufacturer defect or possibly from my husband’s sunscreen (this shirt of course has been washed and the darkening is still present - see photo). It’s only noticeable in certain lighting. Make an offer!