Product backing.
"Update: I can't figure out how to update my previous 4 star review. A boot ripped while trying to remove it and I could not find a replacement on the web site. (I wanted another banks boot because they are the toughest I've been able to find) I called customer service and they sent me a replacement free of charger. And sent a whole set in case there was an issue with that batch. Yall have earned a customer for life, its hard to find a company that willing to make it right."
