New Saguaro Unisex Barefoot Walking Shoe Luck I - Size 40 - these are unisex so check out the size chart for your size. I usually wear an 8-8.5, but when I measured my foot, their chart put me right at the end, so I sized up to the 9-9.5 (women's size column). I wore them TWICE. Once around the house to just see how they felt, and that is when I realized they were just a little too big. Lengthwise, as I know, they are supposed to be wide. I decided to try them again, this time I wore them downstairs to the basement to see if I could workout in them. They did not work out for me. So, they are pretty much brand new, worn indoors only. Really sad because they are super comfortable, but I will have to wait until the size I need is back in stock. From the website: Upper: Flyknit Lining: Mesh Sole: Rubber Sole Thickness: 4mm Waterproof: Not waterproof but quick-drying Closure: Lace-up Unique 4mm-thick Saguaro rubber for flexibility and slip-resistance, ensuring natural foot movement and stability with a zero-drop design. Made from renewable flyknit material, eco-friendly and breathable. Breathable microfiber for added comfort. Ample space for toes, even with toe spacers. Ideal walking shoes for wide feet. We're deeply committed to sustainability, making sure each step you take resonates with nature and compassion.. NOTE: We are a pet-friendly, 420-friendly home. Despite washing, storage totes, and cleaning, I cannot guarantee 100% odor or allergy-free.