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Lightweight: the StormChaser ACE is a light racing bike helmet – 200 grams (helmet size S), 220 grams (helmet size M) and 240 grams (helmet size L) Choice of 3 sizes: S 51-55 cm, M 54-58 cm and L 57-61 cm – the measurements in centimetres refer to head circumference ACE variant: with full-length lower edge protection for premium aesthetics and to protect the shock-absorbing EPS helmet material Secure: thanks to stable and durable connection of the shock-absorbing EPS inner material and polycarbonate outer shell Designed for: unisex racing bike helmet for adults and teenagers – for professional and ambitious road cyclists