The nasal masks are available in six different sizes. Sizes S, M andL are well-known and accepted silicone masks for smaller patientsup to approximately 2 kg (4.41 lbs). The new masks for patientsfrom 2 kg (4.41 lbs) up to 5 kg (11 lbs) are designed for maximumtherapeutic effectiveness and patient comfort using 3D infant facialscan technology. The flexible bellows allow the mask to find a naturalposition over the infant's nose, which helps minimize leaks and maintaina consistent nCPAP level.