http://naughtylawyertravels.blogspot.com.br/2017/03/jonnys-pro-edge.html

Jonny is flying Gerolf's glider in Valadares this week. It has a
cool sail material on the trailing edge. Moyes is calling it the "Pro-Edge". It
makes me think of a fashionably faded t-shirt material. It's apparently
wrinkle-free and they think it improves high speed performance. Jonny said they
may start putting on the leading edge as well. I like the look of it!