Rubber sole Midfoot cage locks your foot in place without restricting movement. Rubber wraps up the sides to help resist abrasion during rope climbs Foam midsole has a firmer foam carrier for comfortable cushioning where you need it and stability for heavy weightlifting. Deep grooves along the outsole allow the shoe to flex and expand in every direction for a lightweight feel as you train. The Nike Mens Free Metcon 2 Training Shoes will take you from a short run to strength training all in one shoe. Designed with a cushioned midsole and flexible sole for superior durability, these training shoes are ideal for boot camps and strength training.