Blanket is SFI 4.1 certified and has durable sewn on nylon straps to allow the transmission to be installed or removed from the race car.
The difference between nylon and Kevlar is weight which generally Kevlar is around five pounds lighter and due to the strength of the Kevlar the blanket is a little thinner and easier to work with around the transmission but the nylon works well in a sportsman type application.
The racer has there choice of nylon or Kevlar for which best suits there application and can be chosen from the drop down menu.