Structure: made up of hooded top and trousers. this product is a one-piece structure. Main performance of the product: 1. Liquid barrier function: 1) hydrostatic pressure of key parts shall not be less than 1.67kpa (17cm H2O). 2) the moisture permeability of the material shall not be less than 2500g / (M2? D). 3) the anti synthetic blood penetration shall not be less than 1.75 kPa. 4) The water level on the outside surface shall not be lower than the requirement of level 3. 2. Breaking strength: the breaking strength of key parts shall not be less than 45N. 3. Elongation at break: the elongation at break of key parts shall not be less than 15%. 4. Filtration efficiency: the filtration efficiency of key materials and joints for non oil particles shall not be less than 70%. 5. Fire resistance: