Freight Wing's Chassis Side Skirts can be used on intermodal haulers to increase operator fuel savings. In as few as 35,000 miles in trailer utilization the side skirts pay for themselves, according to the manufacturer. Fuel economy improvements of 5 to 7 percent found in tests. Available for 46' trailers, and for most other chassis trailers of various lengths. Come in both Dense Matrix Polyethylene (DMP), which can take the most abuse, and in a composite material. The composite skirts have a low coefficient of thermal expansion, allowing the skirts to hold their flat panel shape to give the skirts a cleaner look.