It's cold..... Really cold.

[JThiessen]

Happen to have any better cardboard? One time I got caught in some unexpexted cold in eastern Montana - I stopped in a K-Mart and bought some thick plastic place mats that I cut up to fit in my grill. They actually worked great. Dont let your mom catch you digging through her china hutch...!

You might be able to cut each individual one to fit the four "openings".