Puma ForeverRun Nitro Running Shoes offer a new level of support, focusing on the specific phases of the stride through a combination of Runguide System features. These trainers suit all runners, but are designed especially for those looking for a full soft Nitro midsole without compromising on stability. These features include a newly developed Nitro midsole with two different densities. Softer inside and with a firm edge, the geometry of these running shoes will offer smooth strides. The engineered mesh upper combines with the asymmetric heel buttress to keep the foot in place, and an excellent fit. The optimized outsole design controls general pronation, including a wider medial rubber segment to stabilize delayed pronation.Features: Bi-density Nitro technology provides superior response and cushioning in a lightweight package The blend of the geometry, foam densities and support features promote correct alignment and keep the feet centred with every stride Composed of long-lasting rubber for traction on multiple surfaces The flared rubber under the head of the first medial metatarsal, for a wider support base Specific durability support on the upper and inside New engineered mesh for greater support and as a feature The asymmetric heel buttress stabilizes the feet during impact and temporary pronation Technology: Nitro The advanced technology of the Nitro midsole provides superior response and cushioning in a lightweight package.