KN95 mask. This product attracts attention with its excellent heat dissipation performance. With built-in latest cooling system, it has sufficient airflow for long-term work. The unique weaving process of this product results in a dense fabric having thin strands and a smooth texture more durable and softer than normal bedding. The selection of materials for Blue Star is meticulous. It takes into consideration physical properties (density, melting point, elec/thermal properties, etc.) and mechanical properties (stiffness, elasticity, plasticity, etc.).