A:Answer Hello Dwuan,
Thank you for considering Sony products!
We appreciate your inquiry about the Sony WH-1000XM4 headphones and are happy to assist you. These headphones are not designed to be sweatproof or waterproof. To maintain their durability, it's important to keep them away from moisture and excessive perspiration, as any damage resulting from such exposure is not covered under warranty.
Regarding the ear covers, they are replaceable. You can purchase replacement ear pads through Encompass, our authorized distributor. For more details, please visit: https://sony.encompass.com/item/12582290/Sony/X-5001-118-1/
Best regards,
-Fred