To take part in a world record attempt at Rhossili Beach, Gower.
Wannabe record breakers (over 18's only) are being invited to take the plunge and strip off for charity as well as breaking the world skinny dipping record on a National Trust beach.
will take place at 7am on Sunday, 19 June on Rhossili beach on the Gower peninsula with brave bathers baring all as they dive into the waves.
The existing record, listed in the , stands at 250 naked bathers and organiser Alison Powell is hoping for 300.
"There will be a 'warm up' to build enthusiasm and then a countdown before everyone strips and runs into the water" said Alison.
"What I'm hoping is that we will form a line and run into the sea together. The bathers have to be in up to their waists for 10 minutes to break the record."
Alison had the idea after inviting friends out for a skinny dip in November. Nobody took her up on the offer because of the cold but they were enthusiastic about a summer dip.
She chose Rhossili for the record-breaking swim because it is long and reasonably hidden, sparing the blushes of passers-by.
"It's also such a beautiful beach, she said. I know we will have lots of fun and this will be a once-in-a-lifetime event for most people taking part."
Fundraising from the event is set to benefit both the National Trust and Marie Curie and Alison has asked interested dippers not to be shy about taking part.
"We've had lots and lots of people pledging to take part through our ", said Alison, 35, an online publishing editor.
"We have raised 拢600 already from donations but it's crucial we sign up more than 250 before the day so that we know we will break the record."