Design: The 3D stereoscopic design is intended to fit various face shapes snugly while providing sufficient breathing space and minimizing gaps, which helps prevent glasses from fogging. Layers: They are constructed with 5 layers, typically including non-woven fabric and melt-blown material, which are moisture-resistant and non-toxic. Comfort: The masks are lightweight, featuring high-quality, elastic ear loops and an adjustable nose clip for a secure and comfortable fit during extended wear. Packaging: They commonly come in packs of 20 and are often individually wrapped for hygiene and portability. Usage Note: These are considered general-use protective masks and are typically labelled as non-medical masks.