the moldable material is very hard, when you sleep, the pillow pressure on the ear and these ear plugs will cause pain and redness, you can't even sleep from the hardness of this material..
i tried them during the day to see how much noise do they reduce, after shaping them to a perfect fit of course, they reduce less than 31 decibels, don't buy them, the seller is also not well mannered, he insulted me after my review...
Very, very fast shipping ... ! Good stuff, worth the price !