Size US 5/EU 20 (126 mm / 4.91 in inner measurement) Amazing quality shoes. Can be worn with socks or barefoot, perfect for early walkers. I bought another pair in a larger size to replace these. Kavat is a Swedish company that makes shoes that are meant to be passed down. From Kavat website: Made of environmentally friendly and chrome-free Eco Performance (EP) leather Certified with EU eco-label and guaranteed free of fluorocarbons Water-repellent and breaths well Easy to put on / off thanks to the wide opening Easy to close with a hook and loop Lined with vegetable-tanned leather Reinforced on the back of the heel to protect and keep the foot in place Grip-friendly with rubber outsole