P-10 first came with a small nose cushion and it leaked a lot but was comfortable then later I ordered a med and you were out of them , so I ordered a large . Leaked worse but was still comfortable . Finally , 2 years later , I ordered a medium and it showed right on time . Fit perfect and never leaks ! Very happy with my mask now . A person has to find a mask that fits as well as a nose piece that fits and if you find it , it’s a wonderful thing . I recommend each person tries different apparatus and finds their fit instead of giving up .