Cashel Crusader fly mask, warmblood size, "standard" (no ears, no extended nose) --tried on once, washed twice--this one was WAY too big--didn't read the sizing chart before I ordered and tried it first time  . 
Recommend that if you're not sure about sizing, visit the Cashel website to double check for appropriate measurements.  These fly masks are wonderful but sizing seems to be a little larger overall than some other manufacturers. Cashel offers an extra hole @ top of mask to pull forelock through--great for horses w/ longer forelocks--keeps hair out of eyes!