Can I do hot curling or flat ironing on the wavy or curly hairs?

No. For wavy or curly hairs, these lace wigs have been already processed by a perm for wave or curl. So, it is not recommended to hot curl or flat iron the lace wigs again to avoid any over processing. For straight, Yaki perm straight and light Yak hair, you can use hot curling or flat ironing, because these hairs are naturally curly or wavy.