Nasal masks:

Nasal masks are the original CPAP interface. These are well tolerated by many people. Nasal masks fit over the nose and require straps around the head (called headgear) to keep it in place. If there is leaking of air out of the mouth, a chinstrap can be used to reduce this airleak. Some examples of nasal masks include:

Respironics Profile Lite Nasal Mask:
Respironics Simplicity Nasal Mask:
Respironics ComfortGel Mask:
Respironics ComfortSelect:
Respironics ComfortClassic:
ResMed Mirage Activa Nasal Mask:
ResMed Mirage Vista Nasal Mask:
ResMed Ultra Mirage II Nasal Mask:
Puritan Bennett DreamFit Nasal Mask:
Puritan Bennett SoftFit Ultra Nasal CPAP Mask:
Fisher & Paykel FlexiFit 405, 406, 407 405 shown:
Fisher & Paykel Infinity 481 Direct Nasal Mask: