5" shoe cover with elastic top. Large Size. Tyvek garments are composed of flash spun high density polyethylene which creates a unique, nonwoven material available only from DuPont. Tyvek provides an ideal balance of protection, durability and comfort of any limited use fabric technology. Tyvek fabric offers an inherent barrier to small sized hazardous particles. Protection is built into the fabric itself; there are no films or laminates to abrade or wear away.