I agree with Daryl.................. While Antron is a synthetic fiber it seems to dye well with rit dye. It really depends on the chemical make up of the fibers in the fabric.
According to PB Burch a leading dye expert this is what they recommend.
http://www.pburch.net/dyeing/FAQ/nylon.shtmlIf you are looking for acid base dyes I recommend
http://www.dharmatrading.com/dyes_dyeing_wool.htmlBilly D.