【High-Performance Filter】Reduces sound by approximately 40dB. By wearing these when you're bothered by surrounding noises, such as when sleeping, working, studying, or in public transportation, you can block out unpleasant sounds. 【Achieves Sound Sleep and High Soundproofing】The earplugs come with three sizes: S, M, and L, allowing you to change to the size that best fits you. This provides an excellent fit and complete integration with your ear, creating a quiet sleeping environment. 【Washable & Reusable】They maintain their elasticity even after long-term use, and you can wash them with water to reuse them, making them hygienic and economical. After use, wash with water, dry, and store in the dedicated case. ⭐Instant purchase OK! Free shipping⭐ Please check the actual product photos for the condition. #Nao's product list is here ✨☜ 36-68999 Earplugs for sleeping, complete soundproofing, sound sleep, noise canceling, high performance, sound reduction value 40dB, soundproof measures, relaxation, airplane, study, washable