The Lazer Bob Future World Champion Infant Helmet. This great shaped helmet for your most precious passenger is designed to fit smoothly into most bike seats and trailers. The BOB helmet provides safety for your child even if they only ride along in the back seat. The BOB helmet has the Lazer Comfit3 Retention System for an easy to adjust and perfect fit. Lazer Bob Future World Champion Infant Helmet Features 6 vents to help keep the interior cool 360 degree reflective material assures high visibility Glue on (1-piece) construction Weight: 277 g for a Uni-Size Kids Size: Uni-Size Kids 45-51 cm