denier

Can anyone tell me specifically why a Hyside (Outfitter Pro) weighs less but has a higher denier count (by far) than a DRE Pro? I am geeked out on the specifics and because we can't seem to find a used Hyside (no longer patient) we are looking at DRE Pro 140 vs. a 14 ft. Outfitter Pro. The DRE...