The 3M™ Versaflo™ S-Series Hoods and Headcovers are designed to be used with certain 3M™ Breathing Tubes and Powered Air-Purifying Respirators or Supplied Air Units to form a respirator system. The S-100 series headcovers (i.e. loose fitting facepieces) and the S-400 and S-500 series hoods have a wide-view window (visor) and an elasticized faceseal. The S-403 has an added inner bib or shroud which is worn tucked into work clothing. The hoods and headcovers are held in place with an adjustable, non-replaceable plastic integrated suspension (S-133, S-433, and S-533) or a sewn-in elastic suspension (S-103 and S-403). There are different sizes and fabrics available, and all headcovers and hoods are supplied fully assembled, ready for use.