EPS Inner shell adjustable straps Aerodynamic cooling vents Unique design Cool Graphics This Avigo bike helmet offers protection for little noggins, but it's the fun designs they'll love, whether they're riding in a trailer or on a balance bike. The fun-styled molded shell covers an inner layer of protective expanded polystyrene (EPS) foam for impact protection. 5 vents allow cool, fresh air to circulate over and around child's head. Adjustable straps make it easy to get a perfect fit.