additionally in order to avoid the risk of fire or damage to the fairing resulting from proximity to or actual contact with the truck 39 s tractor 39 s exhaust pipe s which are often hot at their highest points where catalytic converters or other hot antipollution devices are often mounted any aerodynamic device must possess heat resistant properties in this area accordingly in the preferred embodiment of the present invention the top corner sections of the airfoil comprising the present invention are fabricated of or sheathed with a heat resistant and non flammable material such as aluminum or sheet steel examples of which include but are not limited to chrome plated steel or stainless steel specifically as shown in fig4 the upper portions of fairing sides 100 and 101 and the outer portions of fairing top 110 are fabricated of or sheathed with a heat resistant and non flammable material collectively designated 200 in the figures notably the balance of fairing top 110 as well as fairing sides 100 and 101 can be constructed of the resilient material described above and thus still impart the resilient characteristics described above to the fairing structure as a whole notwithstanding the presence of components 200 which by virtue of their heat resistant and non flammable characteristics might not possess the same resilient.