The Brooks Caldera 7 features a nitrogen-infused DNA LOFT v3 midsole for maximum cushioning, a lightweight and breathable TPEE air mesh upper with a secure fit, and a Trail Tak green rubber outsole with 4mm lugs for superior grip on wet and dry surfaces. It also has a stable ride with strategic midsole foam walls, a fully gusseted toungue for lockdown, and is designed for long-distance trail running. The stability and cushioning make this a true all day hiker, runner, or walking companion. Too small for me!