DuPont Tyvek 400 Coveralls Composed of Tyvek 400 flash-spun, high-density polyethylene which creates a unique, nonwoven material. Offers inherent barrier against particles down to 1.0 micron in size. Protection built into the fabric itself, no films or laminates to abrade or wear away. Comfort fit design enables a greater range of movement while stretching and bending with reinforcement in high stress areas. Available in many different styles Pack of 1