DURABLE-The surface smooth PC Shell and shock-absorbing EPS inner shell,In-Mold unibody technology,making the helmet safer and more durable ULTRA LIGHTWEIGHT & VENTILATION- 8 individual air vents,Lightweight kids bike helmet provides maximum ventilation for hot summer rides PERFECT FIT-Super lightweight 270g(0.6lb), One Size:Unisize Adjustable 48-54 cm / 18.9"-21.3",Head Width: 6.5",Ergonomic interior padding is comfortable and secure ADJUSTABILITY & GETTING A SNUG FITA- Adjustable fit dial,360 degree internal removable padding system allow the kids helmet to conform to heads of many sizes, helping the toddler helmet stay in place and better protect the child UNIQUE DESIGN-Unique 3D cartoon cute animal design,exercise the children understand animals and 3D imagination, have a fun time COMPLIANCE-Complies with U.S. Consumer Product Safety Commission Safety Standard for Bicycle Helmets for Persons Age 5 and Older.And ASTM 1447, providing reliable and effective protection in cycling, outdoor skateboarding, roller skating, scooters and other sports Item Specifics: Material:The surface smooth PC shell and shock-absorbing EPS inner shell which provide high ability to resist impact and absorb shocking efficiently Quality cashmere material absorbing sweat buckle, nylon straps, pinch guard chin strap, and an adjustable fit dial Available in one sizes: One Size:48-54 cm / 18.9"-21.3" Lightweight MOOTH VENTILATION :8 individual air vents that will keep you child COOL & COMFORTABLE for HOURS OF FUN riding Start good habits young,protection for their noggin,we recommend using it Bike helmets Tricycle helmet Balance bike helemt Scooter helmet Bike Trailers helmet Pedal Trick helmet Bicycle helmet Ride On Cars helmet Glide bike helmet Other outdoor or indoor activities which need impact protection gear Package Included:1 x Bavilk Bike Helmet ,1 x Bavilk Bag