Aetrex UK to US size chart:

a weatherproof chelsea boot built for comfort and versatility. Featuring arch support and stretch twin gore, it’s a go-to for daily support and fashion-forward comfort. 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.
The Aetrex Orthotic System is Built-In to every pair:

• Our insole features arch support that helps to stabilize your body, align your feet and relieve common foot pain (ie. plantar fasciitis, heel pain & arch pain)
• Our insole features UltraSky™ cushioning to provide pressure relief & extra comfort
• Our insole is lined with microfiber treated with antimicrobial technology to help fight every day odors

Details:

• Adjustability: Stretchy gore
• Upper Material: Leather
• Outsole Material: Rubber outsole for durability
• Removable Insole: Yes
• Heel Height: 1.25"