What is the difference between peştemal and peşkir?
A peştemal is typically a wrap; peşkir refers to a towel or drying cloth. Ask what towels your package provides instead of relying on unfamiliar names.

Related questions
What is a peştemal?
A peştemal is a thin woven bath towel used as a wrap. It is not necessarily a substitute for swimwear under a venue's clothing rules.
What is a bohça?
A bohça is a cloth bundle used to wrap and carry belongings, including bathing textiles. For a visit today, a simple bag is perfectly practical.
What should I pack for a Turkish bath?
Pack swimwear if required, fresh underwear and personal toiletries. Ask whether towels and non-slip footwear are supplied; leave unnecessary valuables at your hotel.