We do not ask your size because our 3D scan will know your foot dimensions down to the millimeter. Our insoles are unisex and can be made from US Mens 14/US Women's 16 down to youth ages 10 and up. If your feet are US Mens 13/Women's 14.5 or larger, you will receive a slightly modified product (the toe area will have a suede bottom cover). Email support@runfast.co if you have questions.

iPhone: X, XS, XS Max, XR, 11, 11 Pro, 11 Pro Max, 12, 12 mini, 12 Pro, 12 Pro Max, 13, 13 mini, 13 Pro, 13 Pro Max, 14, 14 Plus, 14 Pro, 14 Pro Max, 15, 15 Plus, 15 Pro, 15 Pro Max, 16, 16 Plus, 16 Pro, 16 Pro Max

iPad: Pro 11-inch (1st generation), Pro 12.9-inch (3rd generation), Pro 11-inch (2nd generation), Pro 12.9-inch (4th generation), Pro 11-inch (3rd generation), Pro 12.9-inch (5th generation), Pro 11-inch (4th generation), Pro 12.9-inch (6th generation), Pro 11-inch (5th generation), Pro 12.9-inch (7th generation)

Other: If you do not have one of the above devices, there is a 99% chance a close friend or family member can help you scan with their iPhone/iPad! We simply send you a code to your email, and once the app is downloaded on their device, you input the code. It takes 5 minutes, and they can delete the app after scan upload. A small favor to ask for a lifetime of pain-free running.