It's made from two pieces of Gore-Tex-like fabric*, where the water-resistant laminate is facing inwards to reduce wear. So it's ready for all day in the rain.
[*It's really nice fabric, but I bought it off eBay, so it could be Gore-Tex, or it could be a generic. I've been using my seat cover for a few years and it's going strong.]
I'm still working on how best to reinforce the grommets since this fabric is kinda slippery and stretchy and I don't want the grommets popping off. I've been sandwiching stiffer material in between the fabric and that's been working pretty well. Though, it doubles the sewing time. So I'm still working on the construction logistics.
If you're interested in one, you can send me an email for updates: coryleif@gmail.com
If you're looking for something a bit fancier than this, jump on over to Randi Jo Fabrications. Their seat covers are pretty sharp.
Woo-hoo!
Leif Labs: Where you sit.