I've had a couple of races with this cover and the durability is great. The bump keeps you in position, kind of like a poke in the back as a reminder. I recommend installing the start of the bump starting on the second bumpout in the cover. If you move it back further it will be to far back on the Kaw-KX450 (2010). I liked the grip and the bump reminder, looks great on the bike to boot. I had mine recovered at an Upholstery Shop for $30, so if you don't have a good stapler let the pros do it right.
Factory Effex TC-4 Seat Cover With Bump - Kawasaki
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The top of this seat is by far the best part. The grip is pretty good as well as the rigid bumps designed into the seat. However, the fabric on the side I didn't have very much luck with. Installing the seat cover was a little difficult and it ripped twice, luckily I was able to save it. But after riding one time and then pressure washing my bike, the pressure washer did some fair damage to the fabric on the sides. Great grip and all, but not really meant for durability.
Put around 45hrs on it track riding so far, still looks new, keeps you in the sweet spot, and comfortable