Nasal Aire II K2A Kits are designed to eliminate the possibility of incorrect fittings. Each kit contains all SIX sizes of the nose piece, giving the user the option to change the nasal section to obtain the best fit possible. Nasal Aire II consists of a soft nosepiece with exhaust ports and two soft silicone nasal cannulas for fitting into the nasal openings. Some advantages: No pressure points to the face and bridge of the nose. Patients can wear their glasses. Claustrophobic patients are able to tolerate. Easy to clean, with mild soap and water. No complicated headgear!