Is WindWing window PVC ??

[joethewindsufa]

@bluefish1:
Aha - knew i would peak someone's interest
The ice board is the easiest one - skis at an angle
The light snow version is similiar to the snowfer bottom, but does NOT work in deep snow.
The ArcticSail is angled underneath and has a metal edge

http://joewindsurfer.blogspot.ca/2015/10/arcticsail-for-windsurfing-on-ice-and.html
It is a bit heavy compared to my other sleds, but as you say - will probably work with bigger sails - i have been known to use 8-8.5 m² sails even in winter

(have NOT figured out what the red tabs can do - seem removable)

[swchandler]

I would guess that the red tabs loosen up the tail of the board. Without them, the board might be too directional and tough to turn.