MASKb-SBFACE - size M. The breathable and soft fabric will provide maximum comfort while wearing. The mask is 10 times washable and reusable. It is made from stretchable and breathable material. The odor resistant fabric is dust-proof and protects from airborne irritants. The 3D-shape and new ATB material guarantees a perfect fit. Note: this is not a medical mask and not suitable for children due to the size. The size M fits teenagers and most adults perfectly.