I made flaps all around with old rubber reinforced factory conveyor belt. It's a little heavy, but it's flexible and rigid. I attached it with a 2" overlap and bolted it on. The plastic fenders have held up to heavy trail use with no deforming or tearing. they keep me completely dry. They stick out aprox. 3", I had to bracket the front outer corners because I made them wide. My friend has a grizzly with factory fender extenders and they only stick out about 1" and don't do s**t.