English to Dutch Other Cosmetics, Beauty Salon, wellness

I am translating a book about how to advance your career in the salon industry.

The business side of things is clear to me, but I myself do not make use of salon service other than having my hair cut every now and then :-)
So I'm at a loss here.

The term 'wraps' (and foils, I've posted that as a separate question) is used both in the context of hair and nail services. Unfortunately, they are only listed as examples, the technique is not described.

Dictionaries and Google have not been able to help me here.