46 CFR 160.055-8 - Marking.
Each life preserver must have the following information clearly marked in waterproof lettering:
(a) In letters three-fourths of an inch or more in height;
(1) Adult (for persons weighing over 90 pounds); or
(2) Child (for persons weighing less than 90 pounds).
(b) In letters that can be read at a distance of 2 feet: