The other responders are right. No nudity at this spa, swimsuits and mixed genders in all areas except the locker rooms/showers. Lovely food options, byo booze. If you are looking for a spa that is nude and gender segregated, consider Chung Dam Spa in Cheltenham.
People wear a swimsuits there, on a top spa gives you a rope and towels, better to have your own flip flops.
People doesn't go nude and Locker rooms are separate.
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