The 513ADHD Store › ADHD Racing Shirt Image 1 of 2 Image 2 of 2 ADHD Racing Shirt $30.00 Support our racing team with an ADHD Racing shirt. Features our ADHD Squirrel mascot. Size: Select Size Small Medium Large XLarge XXLarge Quantity: Add To Cart Added! Support our racing team with an ADHD Racing shirt. Features our ADHD Squirrel mascot.