1. Material: Silicone 2. Block more sound and improve noise cancellation 3. The earphones fit more firmly in the ear for a more comfortable fit 4. The earbuds are very firmly attached to the rod adapter and will not slip off easily or stay in the ear when removed. 5. When on the headset, the earbuds can be placed in the charging case 6. Comfortable, soft and flexible at the same time, not easy to break when pulled 7. Can be washed and reused
