For the seventh year, Macy's teams up with the Make-A-Wish Foundation to donate $1 for every letter to Santa dropped off in store. And today, on National Believe Day, Macy's is doubling its efforts by donating $2 for each letter.

This year is extra special for Seattleites as the foundation is granting the wish of four-year-old Isaac, who himself is battling a brain tumor. Isaac has made it his wish to build toys for the sick kids at Children's Hospital, and thanks to Make-A-Wish he will do just that. They have built him a custom workbench, and along with the help of some special elves, he'll be hanging out at the downtown Macy's store assembling toys.

How can you help Isaac celebrate National Believe Day? Bring a stamped a letter to Santa and stop by Macy's to drop it off and see Isaac in action. He will be at the Downtown store today, December 12, starting at 10. Can't make it downtown today? Show Isaac your support on social media using hashtags #IsaacWA and #MacysBelieve.

But first, meet Wish Kid Isaac in this adorable video from Make-A-Wish.