The HC405 mask is the upgrade to the Aclaim®2. It features the same "Fit and Forget" technology that combines a unique foam cushion shape and headgear design for a comfortable, stable fit. The major difference between the Aclaim®2 and the HC405 is the hose connection which now swivels instead of being fixed upward and over the head. Includes mask, headgear, small cushion, large cushion, foam insert, and forehead pad.Auto-contouring fitThe foam cushion automatically adjusts to a wide range of nasal and facial contours with simple one-step ease of fitting and no complicated adjustments.Anti-leak systemThe sliding Glider™ Strap provides freedom of movement while maintaining a seal. Mask force remains equal when the head rotates from side to side, minimizing the occurrence of leaks.Quiet usageAn advanced air diffuser system prevents air from blowing onto the sleeping partner and decreases noise that could potentially disrupt sleep.One-step removal of headgearSimple one-step removal of headgear. No ongoing headgear adjustments required.* This mask is only effective when used in conjunction with a CPAP/BiLevel machine