About a week ago, redditor wrud4d shared this picture of his grandfather. He said Grandpa wears the same old shirt every time he mows the yard, and this is the result. The post went to reddit's front page, and someone from Yamaha saw it. The company contacted wrud4d and then sent Grandpa a new shirt!
This one has UPF (ultraviolet protection factor) fabric and long sleeves. No more sunburn! However, as an older person myself, I can guess that Grandpa won't want to ruin a brand new shirt by wearing it while mowing his lawn. That's the reason he reserved that old, thinning Yamaha shirt in the first place.