The Nike Air Zoom Superrep 3 features: - Lightweight mesh for optimal airflow and ventilation. - Flexibility under the toes for effortless bending. - Contoured collar for a comfortable fit. - Grid-shaped reinforcements. These are great for HIIT. These sneakers are equivalent to a women's size 9.5. I purchased them for a High-Intensity Training class to have extra room, but over time, they became too big.