Oh BUMMER! I dye a lot of things around here, but you know, they usually are cotton items. Everything from no-longer white tablecloths to those lightweight ghi's the martial arts schools hand out for free (I use those as pajamas, I'm a ghi snob, those cheap things shouldn't be meant for public use).
I'll check the directions & info... if not, I'm selling those jerseys, I just don't wear them as-is.