The silica gel waterproof and noise-proof earplug is made of imported silica gel and it presents a pine-tree shaped appearance. With the soft texture, such earplug Can make close contact with outer auditory meatus and is comfortable to wear. Such earplug can effectively reduce the high-frequency noise and has little attenuation To the low-frequency sound, so wearing such earplug will have no effect On the language communications. Due to the features of waterproof and noise-proof, Such earplug is the ideal choice for the personnel working in high-frequency Noise environment and underwater working environment.