Summer Sheets

I'm looking to buy a sheet for Maia for summer and/or rainy days.... so the blanket has to be lightweight, durable, and waterproof - anyone know of good blankets?

I first looked on greenhawk.net and the only thing that I saw a nylon summer sheet, but I said nothing about it being waterproof. Then I went into the rain sheet section and one I saw said it would be good for spring and fall. So with no luck there, I went onto weatherbeeta.com This is what I found.
http://weatherbeeta.com/USA/Range/Or...ndardSheet.asp
This one is a little cheaper, but not by much
http://weatherbeeta.com/USA/Range/Or...ndardSheet.asp

They have other choices there too.

Eurohunter Rain sheets are fantastic.... they stock them at Saddleworld... very hardy rugs....love em!

Try www.jumpsandjuniors.com they have the coolest turnout and showsheets on there