T-Fal AirBake Ultra» 15-1/2" x 20" Mega Cookie Sheet Natural Exterior Patented Insulated Air Technology Guarantees Even Baking & No Burning The Bottom Sheet Of AirBake’s Exclusive 2 Layer Design Protects Baked Goods From The Oven’s Intense Heat » While The Top Sheet Ensures Consistenly Superior Results Everytime & Will Remain Rust Free Forever.