64N, 70N, 70W, 76N, 76W, 82N, 82W
(See Sizing Instructions & Diagraph Below)
The first number is the measurement of the Firefighter's index finger. The second part of the size, the letter, comes from the width of the Firefighter's hand across the knuckles. Please see the below diagraph chart from NFPA 1971-2018, Protective Ensembles for Structural Firefighting and Proximity Fire Fighting, for how to size the Firefighter's hand.