The 1540v3 is kitted out with technology that helps deliver mile-after-mile stability and combat overpronation. It's made with two layers of performance foam that offers superior support and a soft rebound. Designed with an ENCAP and Rollbar midsole technology, this runner offers rear foot movement control for feet on runs from 5K and beyond. 10 mm drop: due to variances created during the development and manufacturing processes, all references to 10 mm drop are approximate ENCAP® midsole technology provides support and maximum durability ROLLBAR® with Medial & Lateral TPU Posts for ultimate motion control Synthetic/mesh upper