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I use EVA75 foam (from Clark Rubber, but probably available at other foam places). It's excellent material - robust, matte black, light-weight, excellent insulation, holds shape well when wrapped around the end of an OTA.
I bought a whole roll and cut it myself (much cheaper in the long run), but that's becuase I figured I'd sell the dew shield with any OTA I sell, and make another one for a new OTA from the stock of foam I keep. Otherwise, Clark staff will cut what you need (for a fee). You can get an over-the-phone quote.
I've tried other materials from time to time, and EVA75 has been the clear leader so far. I have no plans to use anything else.
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