AMMO by MIG Scenic Mats - Ground Covering for Modelling Dioramas
Item: Airfield Dusty Summer

From the Manufacturer:

Scenic mat ideal for realistically recreating earthen and grass airfields used in World War I and WWII. Airfield Dusty Summer is also perfect for representing unpaved roads for your small scenes and dioramas with vehicles and figures.
The size makes this product optimum for scales 1:48, 1:35, and 1:32.