All Sage Brush Engine Guard Chaps are designed by our staff and are custom fit for each engine guard model. The process begins with precise measurements from which a prototype is made for a test fitting. Adjustments are made and a final pattern is created. All Sage Brush Engine Guard Chaps are assembled using commercial equipment by professionals. The engine guard chaps are available in a top quality "leather look" marine grade vinyl. They go on in about a minute and come off in less than 10 seconds.