●Material Composition: 100% Synthetic Fiber (Silica Gel) ●1. Soft and Lightweight: It is highly flexible and stretchy, so it does not lose its shape even when pulled or rolled up, and does not strain your ears. It also has a small volume, making it lightweight and convenient to carry ●2. Anti-fray and Easy to Use: Ergonomically designed to fit your ears and ensure that your glasses stay in place even after extended periods of use, preventing them from falling off and providing a comfortable fit ●3. Anti-allergy: Uses silicone material that is gentle on the skin and is soft to the touch, effectively prevents allergies, and is both convenient and comfortable ●4. Excellent Durability: Highly flexible and will not cause ear pain. Long service life ●5. Can be used in a variety of locations: Suitable for glasses frames of 0.1 - 0.4 inches (3 You can satisfy both everyday activities and sports, such as sports, cycling, running, climbing, skiing, etc