Looks like Octagon granny squares sewn together.
DIY Simple Crochet Slippers by mvaleria
Inspiration, since i did not find a pattern, nor can i read Russian.
Collection of socks both knit and crochet.
How to Crochet baby booties style Nike shoes, sneakers
DIY cute crochet owl slippers for kids.
Get The Pattern Here: Wonderful DIY Mini Crochet Slippers