Whether you're training for a marathon or just enjoying a casual run, the Brooks Glycerin 22 is the ideal all-round running shoe. Experience the ultimate performance of the Glycerin 22 every day. Midsole This model features the new DNA Tuned foam, Brooks' next generation nitrogen-infused foam. The dual-size cell technology ensures a soft landing with larger cells in the heel, while smaller cells in the forefoot provide a responsive push-off. Upper Thanks to the jacquard mesh upper with textured yarns, the shoe is highly breathable and allows sweat to escape, keeping your feet cool while running. Because the mesh follows every shape of the foot, it offers comfort and support. The pleated tongue of this shoe is attached to the upper on both sides, so that dirt cannot enter the shoe and the tongue remains centered. The Glycerin 22 has an external lacing system that ensures that the laces cannot touch the foot to prevent irritation. Outsole The shoe features a RoadTack outsole, made from a mix of rubber and recycled silica. In addition, this outsole technology from Brooks is durable and resilient to compression, making them last extra long.