NEW BALANCE. GKRVLLB2. GRADE SCHOOL KIDS FUEL CORE REVEAL BOA. BLACK WITH MARINE BLUE AND TEAM ORANGE. Our Fuel Core Reveal sneaker for kids offers a supportive upper and energizing underfoot feel with a fun look to match. It has a Boa Fit System that offers a customizable fit so that feet can lock in and break out in a snap. Our REVlite midsole technology is super responsive for a speedy ride.