<p>A protective sports helmet includes features that promote efficient fit adjustment and donning and removal of the helmet. The helmet includes a front shell portion pivotably connected to a rear shell portion to promote easy donning and removal of the helmet. The upper region of the front shell optionally is longitudinally adjustable relative to the upper region of the rear shell. Cam mechanisms optionally are provided on the helmet shell for securing straps of a chin cup at desired lengths. The cam mechanisms optionally each include a self energizing grip member that increasingly engages the strap when the strap is pulled taut while the cam mechanism is in the locked position.</p>
