These boots are not branded with a size, but I wear a 9.5/10 and these fit me perfectly. There is the number 40 written on the bottom which could be the European size, but I am not 100% sure. EUC summer boot which means there is no fur lined inside. Such a beautifully made shoe! From the Mou website: Our summer eskimo sneaker in vintage leather offers the perfect mix of a mou icon with a fashion sneaker. This hand-crafted leather style is luxuriously lightweight and comfortable to wear, with an upper in genuine vintage leather; two-tone cotton canvas lining; cotton crochet-stitch detailing; padded leather insole; supportive heel counter and a flexible trainer sole. Mou is a London-based luxury footwear brand founded by Shelley Tichborne in 2002. The handcrafted shoes are durable, soft, and stylish, made with high-quality materials and eco-friendly production methods.