3D Mask Masks for adults Shape 3D Make it close Fits snugly, prevents dust particles. PM 25 Yes. 99% particle size (0. 1μm – 1. 0μm) 4 layers thick Comfortable to wear Breathe easily Because it's a shape Beautiful Creates space for breathing and speaking comfortably. Doesn't hurt your ears Ear strap Flexible Can be worn for a long time without hurting your ears.