The Greater Gaiter
In short, of two bought at the same time, this one is the better of the two.
I purchased this Schampa and a competitor's double layer at the same time. The Schampa single-layer gaiter is a better fit, and was effective in 36 degree weather yesterday at speeds up to 55 and with gusting wind at up to 18 MPH [ca 88 kmH]. As a bonus, on both my 3/4 length jackets (FG Rainier and Jaunt T2) I can fasten the topmost closure snap, which cannot be done with the double-layer. Kudos, Schampa!