Medical Surgical Face Mask shield

4 layers of filter technology – The hard-shell surface let you keep the good shape of the mask and it is designed to not stick to face.Pre-filter – It captures bigger dust particlesMicro-filter – It captures most of micro-particle dustsEasy string adjustmentIt is VERY importANT to make the mask tight enough to your face to restrict the polluted air is not entering through the mask. This special string is designed to use for everyone due to everyone have different size of head.Pull the string sideways for an adjustment.4 layers of filter – Fine dust filtersHard-shell surface – Clean and pleasantString adjustment – Ensures tightness to face and easy to adjust