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Where can I buy a great big waterproof, washable blanket. I want to put it on our double bed for our cats.? - waterproof blanket

Most of the things I've found waterproof to be rather low and picnic! I had a good general appearance, on Google, the company Web sites and eBay.

Ideally, it should be larger than a double bed, so up in the morning to shoot. I do not want a mattress protection or something - this is the beginning. And it must be waterproof and washable!