I don't know if it would work for custom made tire blankets, but when I've needed that material, I just went to Walmart and bought the biggest cheap windshield sunshades they had. Cut it up with scissors for my custom application, and then trimmed the edges with high quality black cloth "gaffer" tape.
Not exactly this, but something like this (I just bought the cheapest "Jumbo" sized ones in the store):
https://www.walmart.com/ip/Motor-Trend- ... g/50136189
In my case, I was stuck parking my car in the sun for a few weeks a few summers back, so I made my own custom window shades for all of my car windows. I don't know if you've ever flown in like a small Cessna or Piper, but most little planes have custom cut window shades out of that same basic material that fit snug in each window and really do block out the sun. I basically copied that concept, and when all the shades are installed, it is actually very dark in the car.
Just a thought for ya if you're trying to do something on your own. I think the in store large size windshield sunshade is like $5. You could put together a prototype (or maybe 2) for $10. Although, real nice high quality gaffer tape isn't cheap (like $18 per roll:
https://www.amazon.com/Premium-Grade-Ga ... Btape&th=1). In my case, the good gaffer tape has held up quite nicely in the sun.