Review on Fosmon Performance Thumb Grips for PS4, PS3, Xbox One, Xbox 360, Wii U - Assorted (8 Pairs) - Enhanced Analog Stick Joystick Controller Accessories by Doris Tran

These were some of the most affordable cases I've found. They're pretty easy to install, by turning them inside out, placing them on the thumb control, and just pulling them back out with the right side. They're actually quite comfortable. They stay in place pretty well. They're just a tad too big for my Xbox One controllers. When installed, they have quite a bit of play. They stay in place during use but are very easy to remove. That's really the only reason I didn't give them 5 stars.