Martial arts in jeans? Two words: Chuck Norris.
From one of the ads:
“These great-looking Western style jeans have a unique hidden gusset which allows greater movement without binding or ripping.”
Gusset. Oh how I wish there were more situations where I could use that word.
UPDATE: My sister just wrote to me and said that she gets to use “gusset” almost daily at her job. Envy.