These masks fit very tight and have reports of speeds in access of 150mph for sustained periods with no problems reported. With this revolutionary material, we are able to cover the air inlet areas on the bumper with no effect on operating temperature, even in hot climates.
The mask is attached with snaps in the wheel wheel area and a 'Stretch Cord" that is built into the bottom of the mask to hold it tight under the car and retaining clips on the top of the mask which hook into the hood opening area. The mask fits "glove tight" to the car. (Install instructions provided with product)