Resurrecting this thread to express my displeasure with the long-sleeve Jaco rashguard. I purchased it a week or so ago from fighterwarehouse.com (who shipped it quickly, no issues there).
I washed it before wearing and it still had a strange chemically smell to it but whatever. It looks great but the actual wearing experience is terrible. I wore it under my gi and it got soaked and stayed soaked. It has NO wicking properties whatsoever. The sleeves and bottom also stretched out like crazy. Whereas typical rashies stretch out and then back to original shape, this just stays stretched.
I really regret overpaying for what feels exactly like a long sleeve cotton T. Of all the rashies I've used (Hayabusa, Rupture, UA, Starter, Quicksilver, Champion), Jaco is the worst.