No person may use a recreational boat unless each PFD required by Sec. 175.15 is--
(a) In serviceable condition as provided in Sec. 175.23;
(b) Of an appropriate size and fit for the intended wearer, as marked on the approval label; and
(c) Legibly marked with its approval number, as specified in 46 CFR part 160. [CGD 81-023, 55 FR 32034, Aug. 6, 1990, as amended by CGD93-055, 61 FR 13926, Mar. 28, 1996; USCG-2013-0263, 79 FR 56499, Sept. 22, 2014]