Not heavy duty, just heavy in weight. Mine is all cotton, it's almost like flannel, very soft. If you google there is a listed phone number if you want to pursue. Marty's suggestion sounds similar to mine and I think I paid more than $200. I was over 10 years ago I bought for my first C4. Saved it and uses it on my '64 since it was so nice. Glad I kept it since I know have my Z!
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