Low tide during a polar plunge isn't easy, according to swimmers that took a dive into Mattapoisett Harbor for the 13th annual Christmas Day Swim.

"Low tide is rough, 'cause you gotta walk out half a mile," said David Smutny, a visitor from Washington, D.C.

Donning Santa hats and other festive gear, 49 swimmers signed up for the plunge, which took place at the Mattapoisett Town Beach at 11 a.m.

Though the weather was only a few degrees above freezing, sentiments were warm and cozy among swimmers and family members, many who brought towels and hot chocolate to the chilly folks after the swim.

The swim was a fundraiser for Helping Hands and Hooves, a therapeutic horseback riding program for people with special needs. Proceeds will fund the organization's riding lessons.

Organizers Jackie and Abby Dyson said this year's swim was a success.

"It turned out much better than it normally is," said Jackie. "There are a lot of little kids here this year."