I bought the Nelson rigg Half cover for my GSX-R750 K4, to protect it from the sun rays while at work for 8-10 hours.
It's a perfect fit. Very nice quality. Cover comes with a carrying pouch and can be attached to your waist while you ride. I never wear it, I just throw it my back pack.
But it's so nice knowing the sun isn't fading my paint on my bike. I live in the desert, and before getting the cover, my bike would always be dusty at the end of the work day. The cover does a fantastic job of keeping the dust off of it too.
I highly recommend this cover for any sportbike.
I purchased the 2XL for my HD Road King Classic. The fit is good and was impressed with the quality of the cover. It kept the bike bone dry through a 30 minute thunderstorm with gusts up to 30 mph.
Getting the cover into the storage bag was a bit of a challenge. It fits nicely in the saddle bag.
I have only had it a month so can't vouch for the durability yet. It appears to be very well made.