The Men's JR Motorsports Official Team Apparel Heather Charcoal Sam Mayer Xtreme T-Shirt is the perfect way to show your support for Sam Mayer and the JR Motorsports team. Made from a comfortable cotton and polyester blend, this t-shirt features screen print graphics that proudly display your allegiance. Whether you're cheering from the stands or simply showing your support, this t-shirt is the perfect way to represent the JR Motorsports team in style.