The popularity of swim briefs---then and now

[Chris997]

Originally Posted by California Dolphin

I've been searching on line photos of men's college swim teams and there's definitely a strong trend for briefs and a lot less for jammers.

Jammers are preferred in comps as they aid in blood flow return, you'll find teams start wearing them more closer to a competition otherwise briefs for training as the pro jammers are $$$$$, that's how its done where I am

[Chris997]

Boys 13/14 is roughly a 30, therefore a 28 would be a boy 12/13, I prefer the boys 13/14 (30) otherwise a adults 30 sometimes sits to high on the hip as I'm not a tall person, as rule boys and adults sizes are very close in cut due to manufacturing variations

[Torchwatch]

The expensive jammers are made from sharkskin fabrics that move through water with less drag than naked skin, the full body sharkskin suits were banned as giving swimmers an unfair advantage.
Lycra jammers have more drag then naked swim and therefore make you swim slower.
You even need instructions on how to put expensive jammers on :
https://www.youtube.com/watch?v=bvQ1LEPYcxU