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'Tis the season to strip down to your skivvies and run through the streets of Boston.

The Santa Speedo Run turned 20 Saturday, as hundreds clad only in bikini-style swimsuits and Santa hats dashed through the Back Bay.

Nic Antaya for The Boston Globe/The Boston Globe
Nic Antaya for The Boston Globe/The Boston Globe
Nic Antaya for The Boston Globe/The Boston Globe
Nic Antaya for The Boston Globe/The Boston Globe
Nic Antaya for The Boston Globe/The Boston Globe
Participants danced at the Back Bay Social Club before the event.
Participants danced at the Back Bay Social Club before the event. Nic Antaya for The Boston Globe/The Boston Globe
Nic Antaya for The Boston Globe/The Boston Globe
Jack Bogorowski headed up the stairs at the Back Bay Social Club before the event.
Jack Bogorowski headed up the stairs at the Back Bay Social Club before the event. Nic Antaya for The Boston Globe/The Boston Globe
A runner posed outside the Back Bay Social Club before the event.
A runner posed outside the Back Bay Social Club before the event. Nic Antaya for The Boston Globe/The Boston Globe
Justin Tayabji, right, led the pack at the start of the Santa Speedo Run in Boston Saturday.
Justin Tayabji, right, led the pack at the start of the Santa Speedo Run in Boston Saturday. Nic Antaya for The Boston Globe/The Boston Globe
Nic Antaya for The Boston Globe/The Boston Globe
Nic Antaya for The Boston Globe/The Boston Globe
Nic Antaya for The Boston Globe/The Boston Globe
Andy Quach danced at the Back Bay Social Club before the event.
Andy Quach danced at the Back Bay Social Club before the event. Nic Antaya for The Boston Globe/The Boston Globe
Jon Root of Boston had his best friend's named airbrushed onto his chest before the run.
Jon Root of Boston had his best friend's named airbrushed onto his chest before the run. Nic Antaya for The Boston Globe/The Boston Globe