A one-piece top with a hood and side zipper. A new design that pursued mobility and comfort --- We emphasized sufficient room around the neck, the hood adjustment feature, and mask comfort. This product is made of a new materia-autoclavable Solotex-and the durability was enhanced for all accompanying items, such as the dedicated machine sewing threads, zippers, and elastic cords. This product does not deteriorate due to autoclave sterilization and washing, and its reliability and life cycle were dramatically improved.