(Photo By Flickr User Jeremy Thompson)

Funline: Eureka, MO

“Attention all roller coaster riders, attention all roller coaster riders……..”

“Get ready for the Polar Coaster baby, baby at Six Flags!  Do you wanna ride?” (add Ohio Players’ “Love Rollercoaster” music here)

Six Flags St. Louis wants you to wear your long underwear come this Saturday, December 7th.

According to WAND-TV, Six Flags St. Louis will participate in the “Polar Coaster Challenge.”

The catch, you have to wear long underwear or a onesie. The first 50 people to show up between 1pm and 2pm in long underwear will get in for free while other participants will only pay $12.07.

After 2pm, participants will be able to enjoy the rest of Holiday in the Park until 9pm.

The event also includes early ride time on American Thunder, free hot chocolate, cookies, and a meet and greet with a polar bear!

For anyone who doesn’t want to participate in the challenge, or doesn’t have long underwear, can bring a new unused cold weather item and will be able to buy a ticket for $12.07 from 2pm to 6pm.