We're working out what we think - we'll add our view here!
Outdoor Research says:
The Storm AscentShell Rain Cap is an evolution of our 3-layer waterproof, air permeable, fully seam-taped AscentShell™ technology, now in a shallow low-profile ballcap style hat for rainy hikes and runs. Breathable enough to work hard without worrying about sweat building up, and protective enough to shed wet weather clear from your face, this is the ultimate rain cap.
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