Electronic ear protection is available as earplugs or earmuffs. PPE for hearing protection consists of earplugs and earmuffs. Dual hearing protection refers to the use of earplugs under ear muffs. It is recommended to use dual hearing protection (earmuffs and earplugs together) when using firearms. However, earmuffs had the least variability compared to earplugs. The kit contains socks, eye mask, toothbrush, toothpaste, earplugs and Viktor & Rolf lip balm. Other common material bases for disposable earplugs are viscous wax or silicone. He was wearing black clothing, yellow earplugs, sunglasses, and an olive green utility vest. Earplugs for sleeping may enhance recovery after major surgery. One major vuvuzela manufacturer even began selling its own earplugs to spectators. In addition, Surefire makes knives, sound suppressors, earplugs, Picatinny Rails and batteries. These earplugs may have caused permanent hearing damage and impairment to servicemembers. Examples of manufacturers of membrane-based earplugs are ACS, Etymotic and Minuendo. Poppy is seemingly transformed, but is revealed to have been wearing gumdrop earplugs. These are important factors to consider when fitting earplugs.