These cute little boots are crochet with medium worsted weight yarn (2 strands together) or using bulky yarn to create a nice thick sturdy boot. Very cute, warm and the front post double crochet really gives it a great texture! Sizes range from newborn to toddler, just change your hook size! I would recommend for toddler sizes to put some puffy paint on the bottoms or spray with a clear plasti-dip to prevent slipping.