US 9/ EURO 40 TRUE TO SIZE The upper of the Chelsea UGG Platform Boots is made from luxurious suede leather, giving them a refined and elegant look that is sure to turn heads wherever you go. Each stitch and seam is expertly crafted, ensuring longevity and durability that will withstand the test of time; the lining of these boots is made from 100% genuine sheepskin wool. This premium material not only provides exceptional warmth during those chilly winter months, but also offers moisture-wicking properties that keep your feet dry and fresh, whatever the weather. Sink your toes into the plushness of the sheepskin and experience a level of comfort you never thought possible.