Created by studying the foot in motion, this minimalist trainer is designed to enhance the foot’s natural ability to stabilize the body during rapid changes in movement. Vegan Mesh and TPU upper, with a rock plate in the sole to protect from underfoot debris. In great gently used condition, and freshly washed in the machine so they're spotless and ready to wear. Label says men's 7.5 but fits my women's size 9 feet perfectly.