Look for Atsko Water Guard's silicone formula.

Excellent stuff, and I *know* some outfitters who have used it successfully.

If unavailabe at a local retailer (I've seen it in WalMart)order Water-Gurad directly from Atsko or through Amazon.com. I have put together orders to cover a year's worth of my family's needs to order directly from the company, as their shipping has been high. I swear by their water-based formula, too, using it on down clothing, fleece wear, etc. It is really great to have rain roll off of fleece clothing. We have allergy problems within the family and find the Sport Wash detergent doesn't bother any of us. A bonus was my son's white painter clothes became much whiter over time. Hikers aren't typically focused on bright tightie-whities, but we do have to live in the real world, too...

Camper*MOM*