Knuckles Hats for Boys 4-7 - Knuckles Baseball Cap Bundle with Knuckles Baseball Hat for Kids Plus Stickers, Door Hanger | Sonic the Hedgehog Accessories. This Knuckles from Sonic the Hedgehog baseball cap set includes one Kunckles hat with adjustable back strap and colorful artwork of everybody's favorite echidna, Kunckles! This Kunckles cap for boys measures 6'' x 5'' x 10'' and with its adjustable back strap, it comfortably fits most young children's heads. Great for any fan of Sonic and video games, this Knuckles baseball hat is perfect to give as a gift to your favorite Sonic the Hedgehog or videogame fan. Officially licensed Knuckles from Sonic the Hedgehog hat for kids of all ages, boys and girls alike, also comes with Sonic the Hedgehog stickers and a superhero door hanger.