The Nike Flex Advance for lil’ kiddos are easy as 1, 2, 3. Nike FlyEase technology provides an extra-wide opening so little feet slip right in (seriously, it’s a piece of cake). Attach the 2-piece strap across the top, and it's done! They're super-duper flexible, comfy and durable—perfect for little one to grow from crawling to their first steps.