Thousands of people are expected to line the sands and take the plunge into the sea at Cefn Sidan Beach on Boxing Day.
The annual Pembrey Country Park Walrus Dip draws crowds in fancy dress from across Carmarthenshire and all in aid of charity.
Now in its 33rd year, previous events have seen Santas and Sumo wrestlers and all kinds of fancy dressers including Pantomime dames and even bikini beauties and brave mankini clad hulks making a dash for the freezing waves.
People have also been spotted entering the water in top hat and tails and even taking an ironing board into the water in a pop group Queen spoof.
Those braving the challenge are being asked to arrive by 10.30am to avoid congestion at the park entrance, and to be at the start line by 10.45am for an 11am dash. Admission is free.
Carmarthenshire Council’s Chairman Mansel Charles will be signalling the countdown to the dash. Cllr Charles will also be handing out certificates to the chilly participants at the Ranger Station close to the main entrance to the beach.
The RNLI will be on hand again this year alongside St John’s Ambulance.
Since its inception in 1984, only two dips have been cancelled. One due to an oil spill, and another when the sea froze over.