We designed these universal engine jackets to help keep heat in and the cold off the motor so it will perform better with less sputtering and hesitation. Engine Jackets are designed to work with a P3 heat shieid on head pipe. These will fit most modern dirt bikes with minimal triming. Engine Jackets come in Orange, Yellow, Black, and Blue. There made from a special 40 mil thick pvc vinyl. Proudly hand made in the USA. Thanks for checking them out! Free shipping in the lower 48. $25 flat rate for Canada. The heat shield does cost a bit but you will never burn a hole in your nice new snow pants or moto pants again.