1、3 LAYER: The earplugs adopt a three layer umbrella shaped design, which can attenuate the impact of sound waves on the eardrum three times. 2、WITH FILTER: An acoustic filter (diaphragm) is added at the bottom of the earplugs, which can effectively reduce various high audio noise in the background environment while retaining soft sound quality. 3、CLOSE FITTING: The three layer head of the earplugs, from small to large, can better fit the ear canal of the user. 4、LIQUID SILICONE: The earplug head is made of liquid silicone that is soft and elastic, without swelling or pain in people ear canal, suitable for use by various people. 5、EASY CARRYING: The earplugs are super comfortable to wear, and comes with aluminum bottle and hanging buckle, making it easy to carry.