| first of all, there is no difference concerning which systems you use. they are practically the same frame, so the sizing is the same. My head can barely fit into a medium chinese mask(like ones BG or Absolute sell), but for LP medium, it doesnt fit at all. So I am guess LP masks are half a size smaller than house brand ones that sold by BG or Absolute. With that in mind, I advise you that try on some1 else's LP masks before you buy since 25 is pretty close to the edge of medium(the ones in the sizing section is the true size, ones in the mask info setions are one size smaller than it should be). It might be tight and uncomfortable for you if you have a irregular head shape, like round face or really long face. I am buying one too, but I tried it on at summer national, so i what I should buy. (26' head, medium is too short for me, and I have a fairly round face) | 
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