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Watch out…the Hammerhead could give you a nasty bite! This helmet has popped up from the deep to take you on a jaw dropping ride, safe in that knowledge that your head is protected against any bumps and knocks you might have along the way.
If your child's head measures 53.9cm we would strongly recommend you go for the S size. In our experience the S size will be a good fit. Don't be tempted to buy a helmet that they will grow into as it won't offer full protection. A 5 year old's head typically grows ~ 0.5cm in circumference in a year.