The FlexFit Family of nasal and full face masks offer an out of box solution designed to increase patient comfort and improve homecare efficiencies. Each mask is packaged fully assembled, ready to go and all sizes are included. Model HC405A is the standard FlexFit nasal mask, while the FlexFit HC407A is the premium nasal mask. The new and revolutionary FlexFit HC431A full face mask fits under the chin to help prevent air leaks. All masks include glider strap and headgear.