Celebrating the 10th year of the Santa Speedo Run, over 500 participants braved temperatures hovering around freezing, but with wind chill making the air feel as cold as 20 degrees. Starting at Lir on Boylston Street, they ran a 1 1/4-mile loop down Boylston to Berkeley and back up Newbury Street. Each runner raised at least $250 to participate, with funds going to Crossroads for Kids and Bottom Line.

These runners wrote messages on the body, ranging from "Free Tiger" to this man's proclamation of his love for dear old Mom.