I started double masking last year when I returned from Singapore. “I got used to double masking then as it was encouraged over there. He said while double masking was not mandatory together with the face shield, it would give maximum protection. According to another infographic he shared, an unknotted surgical mask blocks 56.1% of particles, a cloth mask (51.4%), a knot and tucked surgical mask (77%) and double masking (85.4%). Kitchen staff Am Khoo, 26, who adopted the habit of double masking, said she heeded the Health director-general’s recommendation to double mask.