http://www.amazon.com/prAna-Mens-Short-Black-Medium/dp/B002O17IXA/ref=sr_1_1?ie=UTF8&qid=1418727578&sr=8-1&keywords=prAna+Men%27s+JD+Short I did a quick read over this item but saw no explanation for "JD". We may suppose that it is just a catchy designation for the product not unlike an advertiser telling us about the wonder chemical in a product, like "ZX3" or something like that. It may just be a catchy product specification. . Perhaps it comes from "Jogging Design" or "Joggers Design" .