Sonic the Hedgehog Hat Set for Kids - Bundle with Sonic Baseball Cap, Temporary Tattoos, and More | Sonic Merchandise for Boys. This Sonic the Hedgehog cap set includes 1 Sonic baseball hat with an adjustable back strap and colorful artwork featuring Sonic himself. Sonic the Hedgehog cap measures 6" x 4" x 10" and with its adjustable back strap, it comfortably fits most young children's heads. Great for any fan of the Sonic the Hedgehog video games, this Sonic hat for kids and toddlers is perfect in a Sonic gift set or as party favors at your next Sonic-themed birthday party. Officially licensed Sonic the Hedgehog merchandise for kids. The Sonic baseball hat for boys and girls also comes with temporary tattoos and a Beach Kids Rexman door hanger.