Hi Roz,
Thanks for the question. Please note we are not experts at curling synthetic wigs, but have linked to a great resource below which seems to have lots of great advice!
The best hot roller choices for curling synthetic hair (from our list) would be either the Caruso C97953 30 Molecular Steam Hairsetter (steam based rollers which specialist online guides recommend) or the Conair Infiniti Pro Instant Heat (which has 12 different temp settings and the rollers are heated from the inside out which will additionally protect your hair/wig).
The Caruso does not have variable heat settings but describes how long you should leave the rollers in based on your hair type (read more in the manual here -> https://images-na.ssl-images-amazon.com/images/I/91LuahMjZ1S.pdf).
https://customwigcompany.com/pictorial-guide-rollers-part-two-goofus-gallant-edition/
Hope this helps a little, good luck with your search for the right product.
Kind Regards,
Lisa
Thanks for the kind words Patty, comments like yours make it all worthwhile.
Kind Regards,
Lisa