Innovative Design: Interchangeable silicone, foam, and silicone + foam earplugs for versatile noise reduction in different scenarios.Recommended Combination: Slow rebound foam earplugs for peaceful sleep, nano silica gel with slow rebound foam for work/study/travel, and double-layer silicone for sports and recreational activities.Superior Noise Reduction: Enjoy exceptional noise reduction with a 31dB Highest SNR rating, especially with the nano silica gel and slow rebound foam earplugs.Reusable and Hygienic: Made from soft and washable silicone material, ensuring durability and cleanliness for long-term use.Ergonomic Fit: Designed with an in-ear shape for easy and comfortable insertion, providing a secure fit without protruding.Convenient and Portable: Comes with a practical earplugs case and special box for easy storage, protection, and travel.