Countdown to Christmas Hot Wheels Style. With colorful Christmas-themed packaging and 24 windows for daily surprise Hot Wheels themed gifts. Start unlocking surprises on the first day of December for a Christmas day countdown in Hot Wheels style! This Hot Wheels Advent calendar will delight kids of all ages. There are eight decorated Hot Wheels vehicles and sixteen accessories for every day leading up to the holiday. The Hot Wheels Advent calendar now includes a brand-new foldout playmat for kids to play with their new Hot Wheels vehicles and accessories!