SOULWIT Cooling-Gel Earpads Cushions Replacement for Sennheiser HD650, HD660 S, HD660S2, HD600, HD6XX, HD58X, HD580, HD565, HD545, HD535 Headphones, Ear Pads with Ice Silk Fabric - Dark Coffee

Seems alright. Not that deep when compared to something like original velour from Sennheiser or even the new velour ones from Brainwavs. And this might be my biggesr gripe with it. My ears are big and they touch the cups even with the original ones, so these definitely aren't comfortable in that regard. But fitting it was easy, unlike what others commented. I didn't use the foam that came with it though. Sounds alright. I am not a trained ear or a huge audiophile by any means, but to my ears they don't change the sound too drastically. Slightly more v-shaped sound signature but the mids are still perfect and crystal clear. Can't comment on build quality yet. They feel soft and will be comfortable for someone with small ears. I do hope that this is real leather and doesn't flake. They look great on my HD600s. And as for heat retention, it's still winter so can't comment on it. But I wish these were fenestrated and hence more breathable

Value for money. Fits my HD6xx perfectly. Ears gets a Lil warm but that's fine. U can put water droplets in the earcups but haven't tried that. Overall very comfortable and only costs less than half of the price compared to original Sennheiser earcups.

These are actually quite amazing, doesn't alter the original sound signature for an audiophile like me, and keeps ears cool and build quality is quite good no complaints! I went with the cooling gel ones. Bass is as is, treble is as is, vocals are crisp, I might have noticed maybe 5% airiness in the sound reduce but that might be due to new pads and they need to wear in to get to a better state. Apart from that very happy with my purchase.

A bit too soft compared to original ones, doesn't change sound much, they're also aren't much thick so might not be for everyone, not worth the price though... Could have been cheaper

Very high quality ear pads, but they drastically alter the sound of the HD650. It is the HD600 that sounds better with these pads.

This is a perfect replacement for the Sennheiser HD 600. It’s comfortable and easy to install and the cooling effect works brilliantly. The best part is it doesn’t alter the sound quality or compromise the audio fidelity like the original pads.

These are much more plush, comfortable and cooler than stock HD 660S2 velour pads. Excellent for long wearing sessions!

Got this as it was much more cheaper than getting the original ones. If you're looking for a better sound, DO NOT BUY this. It WILL change the sound of your 660s (not bad but I prefer the original ones) This is okay if you don't mind a small change in your eq curve and soundstage. But besides that, this is a well made product, Good material, cools well and a good built.