Meet the world’s best workout shoe: the Trainer AD 1. It’s designed for everything from base runs, box jumps, and burpees, and it’s made with sustainable and recycled materials like algae and plastic.The Trainer AD 1 is designed to have a snug fit, but will break in and form to your feet after a few wears. Most customers buy their regular size but if you have wide feet, we recommend going up half a size.Please note our shoes are unisex and our men’s and women’s offer the same fit. Men’s sizes are 1 full US size smaller than women’s – for example, if you are a women’s US 10, you can purchase a men’s US 9.