Have used these Nikes back in 2015 ( Nike Free 4.0 v3). Personally loved the comfort of these shoes. I can't find these anymore where I live ( not in the US).
Amazon.com | Nike Flex 2015 Rn Big Kids Style: 724988-600 Size: 5.5 M US | Athletic
Amazon.com | Nike Girl's Flex Run 2015 Running Shoe (GS) Lava Glow/Pink/White/Lime Size 6.5 M US | Running