Oklahoma City Thunder Men's Concepts Sports Homestretch Flannel Boxers. These men's plaid boxers are made of 60% cotton/40% polyester flannel for extra all day comfort. The boxers are completely functional, with an elastic waist and single button fly that will make these truly become your favorite pair. The Thunder shorts have the logo embroidered on the left leg to show your team pride. Go Thunder!! Officially licensed Oklahoma City Thunder fan gear.