The cover fits perfectly with no baggy loose parts like all the rest i have used. Its made of quality thick rubber material that snaps snuggly around the whole controller. Puzzles me how some have said they were snapped as they are packaged well enough. All you have to do is always hold the thicker bits never the thinner parts and ease them over carefully. I could see over stretching tearing them but a bit of care and you'll be fine. The nobbles give great grip and are way better than the bear controller. No sweating no slipping feels comfortable in your hands.
The thumb grips are way better than the cheaper ones and theyre so simple to install too. You just turn them inside out place them in the middle and let them snap back over the stick too. Job done. Like i said ive had loads and the rest have always been too thick restricting your play. So when you push forward the grip hits the rubber cover and impedes it. Meaning your having to put loads of pressure to go in the direction you want to go. That does not happen with these at all and i can see a lot of precise and quality work went into both the cover and grips.
They maybe a little dearer than some but are well worth the extra. Just get some you wont be disappointed.