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Electra Heartchya CE Helmet in White

retention system provides a secure and snug fit. easy-to-use magnetic fidlock buckle. size small fits circumference 48 cm – 54 cm and hat sizes 6 1/2 – 6 3/4. size medium fits circumference 55 cm – 58 cm and hat sizes 6 7/8 – 7 1/4. the size large fits circumference 59 cm 61 cm and 7 3/8 7 5/8. small size generally fits children while medium and large sizes fit adults.