The DuPont TY657S Tyvek hood extends over shoulders to provide full head protection. One size fits most. Pullover hood design features elastic face opening for good fit around PAPR. Tyvek garments are composed of flash spun high density polyethylene which creates a unique, nonwoven material available only from DuPont. Tyvek fabric offers an inherent barrier to particles down to 1 micron in size. Protection is built into the fabric itself; there are no films or laminates to abrade or wear away.