Allegro maintenance free Saran hoods are designed to protect workers from a broad range of hazardous chemical splashes and moisture. They are made of heat-taped seams for a gas & liquid tight seal, and feature a double-bib design for user comfort and smooth head / neck movement. These NIOSH-approved hoods have a multi-layer foam made sound dampening system to prevent twisting or crushing during use, and are integrated with co-polyester lenses for clear & distortion-free visibility.