In noisy work environments, the use of earplugs, which form a seal in the ear canal, can help prevent hearing loss by preventing noise exposure. In addition to being more comfortable to wear over a long period of time and in hot or humid conditions, earplugs are also more portable than earmuffs. This is because they can be accessed during all hours of the day. It is possible to wear earplugs under hard hats, faceshields, and eye protection as well. When these devices are used together with earmuffs, the noise reduction ratings of these devices can be increased considerably.