What is Fit, seal and IP rating?
Ear tips, clamping force, and sweat/water resistance.
Short answer
For gym use, IPX4 minimum; for over-ears, check clamp pressure with glasses on.
Fit, seal and IP rating when buying a headphones & earbuds
Ear tips, clamping force, and sweat/water resistance.
Why it matters: A bad seal loses all the bass and most of the ANC. Fit is the single biggest variable.
Look for: For gym use, IPX4 minimum; for over-ears, check clamp pressure with glasses on.
Full Headphones & Earbuds buying guide