Aetrex UK to US size chart:

Our #1 best-selling sandal for a reason. The Jillian is constructed with Aetrex Signature Arch Support that is strategically placed to align your body. This fully adjustable sandal features memory foam cushioning, strategically placed straps to help relieve bunion discomfort, a padded heel for extra comfort, and an ultra-light cork midsole to help make it much easier to walk around all day. The signature braided detailing makes the Jillian both comfortable and stylish for all your summer adventures.