If the headband and padding on your Sennheiser HD 800S are loosening or flattening, there are a few options for restoring them. Regular usage can cause the cushioning on headphones to lose form, and when the materials wear down, the headband may feel less secure. To recover the padding, consider replacing the earpads and headband padding, which may be acquired from Sennheiser or third-party vendors.
If you don't want to replace the padding, you can gently massage the flattened regions to redistribute the material and improve the cushioning. Adjusting the tension on the loosening headband by gently bending the metal band inside (if your model allows for it) may help reestablish a snug fit. However, be cautious when making any adjustments to avoid destroying the headphones.
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