Review on Hikfly Silicone Gel Controller Cover Skin Protector for Sony Playstation 4 PS4/PS4 Slim/PS4 Pro Controller - Set of 2 Camouflage Covers with 8 FPS Pro Thumb Grip Caps (Red/Blue) by Andrea Sonnier

Fits right and is a good colour. Work SLOWLY and CAREFULLY when applying as the silicone is thin in places and will break if careless. I put mine on luckily without damaging them. I've tried double-sided silicone buttons but haven't found a favorite yet. I'm using the default now.