Whether you're training for a marathon or just enjoy a leisurely run, the Brooks Glycerin 21 is the ideal all-round running shoe for the neutral runner. Go for short or long runs; the Glycerin does it all. This makes it suitable for both beginners and experienced runners. Experience a new level of running with this all-round running shoe! Midsole The Glycerin 21 has the updated DNA LOFT v3 foam from Brooks. An innovative foam compared to its predecessor by implementing nitrogen in the foam. Adding nitrogen makes the foam even more responsive while running. Brooks' DNA technology provides a foam that adapts to your running style. The result is a modern foam that provides great cushioning. Finally, the ORTHOLITE insole provides soft step-in comfort and long-lasting cushioning. The sole consists of open cells, which makes the sole breathable and ensures that your feet stay cool. Upper The airmesh upper of the shoe gives your feet the comfort they deserve while running. The airmesh upper provides ventilation to keep your feet cool, and this material also encloses your foot comfortably. 3D Fit Print technology was used to design the upper. This technology adds extra structure in strategic places and increases the flexibility of the upper. Recycled materials have been used to produce the upper, sustainability and comfort come together in this shoe. Outsole The shoe has 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 extra long lasting. Run at your own pace on the Brooks Glycerin 21 and push your limits!