65% Foam Kit

The pieces fit the case cutouts perfectly, and I love that I can stack or remove layers to tune the sound without swapping anything else. Took about ten minutes to install everything and the difference in acoustics is immediately noticeable.

I wasn't sure the extra layers would make a difference, but popping the gasket foam in completely killed that hollow echo in my SixtyFive. The pieces fit exactly where they're supposed to, and having the option to leave some out means I can dial in the sound without a permanent commitment.

Finally, a kit that covers every piece of the board — I swapped in each piece one by one and could actually hear the difference in the bottom-out. The fit is precise with no trimming needed, and my spacebar sounds much less hollow now.