Boston Bruins players suited up earlier this week for a special mission that required a fair amount of gear.
Specifically: a reindeer costume, a snowman costume and several princess outfits.
For their annual visit to the Boston Children's Hospital this year, six Bruins players dressed up as characters from the Disney hit movie "Frozen."
Defenseman Dougie Hamilton, who adopted the role of Elsa, the Snow Queen of Arendelle, said he was more than happy to wear the costume.
"I think it's fun, whatever can make them smile," he told the Bruins blog. "It's all about fun for them, so no shame at all."
Bruins forward Matt Fraser dressed as Princess Anna, Elsa's sister. The other players in costume were Kevan Miller as Kristoff, Matt Bartkowski as Sven the reindeer, Seth Griffith as Hans, and Torey Krug as Olaf the snowman.
Hamilton, who even threw in a pirouette or two, added, "I've seen the movie and I'm a fan so I'm not going to lie about that."
Krug and Bartkwoski, meanwhile, knew the words to the movie's theme song, "Let It Go," and took to singing it in the hospital, leading Sports Illustrated to wonder who had more fun during the visit -- the children or the players?
PHOTOS from their visit, below:
CORRECTION: A previous caption provided by Getty for one of its photos included in this article misidentified one of the children receiving care in the hospital as "Michael." The child's name is Lilia.