Original Kabel Heavy in an advertisement form the mail order magazine “The Boy’s Buyer” as seen on Imprint.
The ads in Boys Buyer, a rather ambitious little trade journal, were geared to the clothing buyers who congregated once or twice a year for their profession's New York convention. One of the big sellers of 1930 was the Polar Patrol Playsuit (of course). And modern boys' underwear took away a prize too. How many average boys wore these garments is not clear, but they were designed for little men, not kids before becoming men.