Made from a soft natural twill fabric toe-cap and a natural, eco-friendly jute sole that breathes. Soludos will stretch so when they arrive they may feel a little tight at first. This is a good thing. Like a great pair of jeans their cotton upper will shape to fit your feet with wear. Soludos uses European sizing and fit true to size (US size 6=36, US 6.5=37, US 7-7.5=38, US 8-8.5=39. US 9=40, US 9.5=41). Keep dry for maximum lifespan.