Protective clothing is worn over personal clothes to protect workers from environmental hazards. Arc flash and flame-resistant clothing protects workers from flames or electrical hazards. Welding clothing protects against burns caused by heat and sparks. Aluminized clothing reflects heat when working near fire or in forges. High-visibility vests and clothing are made of bright colors and reflective materials. Cut-resistant clothing protects against lacerations when working with knives and sharp edges. Cryogenic clothing protects against burns caused by extremely cold liquids. Chemical protective clothing includes encapsulated suits, coveralls, and sleeves to keep workers clean and protected from harsh chemicals. Cleanroom clothing is low-shedding and worn over a worker's clothing to keep areas clean. Hairnets, bouffants and beard nets prevent hair from falling into food and other substances. Liquid and particulate clothing protects workers from hazardous and non-hazardous powders, aerosols, and liquids.