The Lazer Bob Chickaa Uni Size Kids Helmet is a great shaped helmet for your most precious passenger is designed to fit smoothly into most bike seats and trailers. Lazer Bob Chickaa Uni Size Kids Helmet Features 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 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