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Hornit helmets are a bit, no a LOT, cooler than other kids' bike helmets. Designed with the spirit of individuality, there's a helmet to suit any personality. And, most importantly they keep heads safe but stylish. They are fully adjustable, comfortable, lightweight and also come with the added safety feature of an integrated LED light.
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.