Four hundred participants will swim through central Dublin this afternoon as part of the 96th annual Liffey Swim.
Swimmers from as far afield as the US and Australia are taking part, with the age range going from swimmers in their teens to those in their 70s.
The 2.2 kilometre course starts beside the Guinness brewery at 2.30pm (men's) and 3.30pm (women's), with the finish line at Custom House Quay.
Anne Marie Kenrick of the Phoenix Swimming Club in Dublin said it was a unique experience with a very special appeal.
"Maybe the 30 or 40 minutes in the water isn't the cleanest you've (ever spent in water) in your life, but you're going under bridge after bridge after bridge - places that you'd normally walk," she said.