Unlock a creative countdown to Christmas with this unique advent calendar featuring 24 days of stretchy putty and fun mix-ins. It includes clear base putties, silver glitter, and an array of assorted holiday-themed charms behind each door so your kiddos can invent personalized putties all season long. Crazy Aaron's Thinking Putty started as a hobby that turned into a full-fledged passion project with the intention of sparking joy for kids of all ages.