I use the Gruvgear ones. These come in 4 sizes, Small, Medium, Large, XLarge. I have two of the Large sized ones, in blue (SKU is FW-1PK-BLU-LG). They fit pretty nicely on the 5, and while they fit over all of the strings on a 6, I feel like it doesn't quite mute as well on it. It could be that I just need to tighten it a smidge to help. I think an XL would've been too bulky, so I'm happy with the L even on my 6 - it takes care of any ringing I have, which is all I ask for.

