At a discount price 15€, I got a JLab rewind retro wireless headset with an extra pair of earpads that can be used to upgrade my Koss. Cheaper than ordering Yaxi pads
Rewind Wireless Retro Headphones with 12 hour Bluetooth playtime - JLab International
Rewind Wireless Retro Headphones with 12 hour Bluetooth playtime - JLab International
JLab Rewind Wireless review | TechRadar
JLab Audio Rewind Wireless Retro Headphones - White - Bluetooth 4.2 Twelve Hours Playtime Custom EQ3 Sound Play and Pause Your Music Answer & Hang Up Phone Calls and Track Forward Throwback