This custom-designed patch is earned by completing all of the Centennial Challenge hikes, either with a Club-led hike, or on your own. PLEASE BE SURE YOU HAVE SUBMITTED YOUR DOCUMENTATION BEFORE YOU ORDER THE PATCH; see "Celebrating 100 Years/Centennial Challenge Hikes. Iron-on, measures 3.5x 4.25 in. Allow 7-10 business days for delivery.