Aetrex UK to US size chart:

You Will love the charming and comfortable design of the Charlotte! Featuring a functional lace-up design, these sneakers ensure a secure and comfortable fit. The lightweight UltraSky™ midsole and rubber outsole provide superior cushioning and support for all-day wear. Made with Aetrex Healthy Ingredients, the Charlotte is an excellent choice for daily wear and fashion.
Each Aetrex shoe is anatomically designed based on data and learnings from over 50 million global foot scans. This ensures you’re getting the best fit for your feet and premium support for your body from the ground up.