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Durable Soundproof Sleeping Ear Plug Waterproof Earplugs For Sleep Special Mute Soft Slow Rebound Portable Anti-Noise Protection Feature: 1. The earplugs adopt creative sponge formula and technology, which has stronger sound insulation effect 2. The interior of the earplugs is designed with high-density micro-vents, so the ears are not stuffy, the noise reduction performance is effectively improved, and the comfort is relatively high Instruct: 1. Knead the earplugs thinly, and twist the earplugs back and forth into uniform slender strips, the thinner the better (remember not to squeeze the earplugs, as extrusion cannot penetrate deep into the ear canal) 2. Lift the auricle and wear it at the same time, lift the upper auricle around the back of the head with one hand to straighten the ear canal, and rotate the other hand to slowly insert the wiped earplug into the ear canal 3. Block the bottom of the earplugs with your fingers for 10-30 seconds, feel the earplugs slowly rebound and fill the ear canal 4. There may be some errors in manual measurement, please understand. 5. Due to the difference between different monitors, there may be some differences in color.