1. The noise reduction and sound insulation earplugs are made of elastic material, providing a comfortable fit and improved adhesion within the ear canal for a secure and stable wearing experience. 2. Designed to not interfere with the charging case, even larger sizes can be safely stored inside. 3. Ergonomic design conforms to the natural shape of the human ear canal. Body heat-activated material ensures a soft, comfortable fit without causing ear fatigue. 4. Molded to match the original earphone shape for a snug fit and effective sound isolation. 5. Nano-coated surface is soft and breathable, allowing for extended wear without discomfort. Compatible with: WF 1000XM4, WF 1000XM3, Airdots 3 Pro Earbuds Note: Product appearance and printed text may vary slightly between batches, but this does not affect functionality. Color: Gray Material: Sponge Size: M Package Contents: 3 pairs × sponge earphone covers for in-ear headphones (Only the above items included; other accessories not included) Note: Lighting reflections and screen settings may cause slight color variations between the image and the actual item. Measurement error allowance: ±1–3 cm.