Need to find the right CPAP Mask? There are different styles of CPAP masks to choose from. Depending on your preference and OSA cause. Our friendly chart below can help you with choosing the right CPAP Mask from CPAP Store USA’s large selection that is compatible with your CPAP Machine or Mask. • Nasal CPAP Mask only covers your nose and is most commonly used. • Full Face CPAP Mask covers both your nose and mouth. This is ideal if you breathe through your mouth at night. • Nasal Pillows CPAP Mask goes one step further and actually seals your nostrils by fitting directly onto them.