A sport helmet having an outer shell, an inner padding for covering at least partially the wearer's head, an occipital inner pad for facing the occipital region of the wearer's head, a rear support having an upper part hingedly mounted to the helmet and a lower part mounted to the occipital inner pad, and a biasing member having a portion abutting the rear inner surface of the outer shell such that the rear support and occipital inner pad are movable between a first position wherein the rear support is biased to extend inwardly from the rear inner surface, and a second position when the wearer puts on the sport helmet to cause the rear support and occipital inner pad to be deflected towards the rear inner surface while the rear support and occipital inner pad maintain pressure on the occipital region of the wearer's head.