I tried these on a pair of AKG k240's. They fit, but make the headphones half way between over ear and on ear. It's still reasonably comfortable to where them, so long as it's not for hours. They do make make it quite hot, though. With the Cosmo pads I used on the AKG k240's, my ears are never hot. With these Hamilton Buhl hygenx45's, I start sweating from where they are touching. This is a concern, in terms of bacteria, as the whole point is headphone sharing. Maybe these are intended for smaller headphones (despite being the largest size). Anyway, for short use, they are appropriate, but they shouldn't be used for longer than 1 hours (at least not in my configuration) as they can cause sweating.