Made with complete and utter safety in mind, Champion Hats are repeatedly tested to gain the highest standard in safety. Tough yet lightweight ABS moulded outer - prevents penetration against sharp objects whilst helping to spread the force of impact over a larger surface area and to protect the polystyrene inner from disintegrating during impactPolystyrene liner - provides the cushion which helps to absorb and reduce the amount of impact to the head as the beads crush together to help reduce any bruisingAdded foam around the inside - to ensure a comfortable, secure fitVentilation system - to ensure your little ones head stays nice and cool 4-point padded nubuck, fully adjustable harness - provides stability and comfort Quick release fasteningSafety standardsVG01 01 201PAS 015:2012Here are the sizes available and the head circumference in cm for each one:00: 50-51cm00 ... More info