True - thick moving blankets with a wool blanket underneath - sitting on the smoker.
Just watch out for the synthetic fiber or poly blends - will melt.
Natural fibers suggested, here.
Been there; done that - scraped the melted fibers off the pit.
Cooking at Mason-Dixon BBQ Services
Lang 84 Deluxe Kitchen known as "The Glamazon" , Custom Klose Backyard Chef... of Snot, and a 22.5 WSM
Lang 60 Mobile - The Damsel II, Lang 48 Patio - The Damsel, Bubba Keg Grill - RIP, Double Barrel Smoker and a BSKD