NoizeBlox earplugs, with their funky and cool design, are manufactured from soft and light-weight hypo-allergenic PVC free foam. The excellent sound absorbing foam used in Noizeblox gives them a very high SNR rating of 35dB, they are ideally suited for use in extremely noisy environments. Their unique tapered design will insert easily into most ear canals, even those that are small. The foam will gently seal your ear and fit snugly without exerting any pressure that could lead to discomfort. In fact, they are so comfortable you could even forget you're wearing them.