[TheDude]

Micromask - very very low volume, but not compressible. Good for medium depth diving I would say till 60-70m, I don't think its good for the really deep stuff. You have to be very accurate with equalizing it, with the low volume and non compressibility it will sometimes either rapidly suck on your face when you put less air in, or you lose some of the air if you put just slightly too much.

But it has a very good and clear field of view, with almost no restriction. Perfect also for recreational diving.