Upgraded to use only their dynamic and lightweight NITRO foam through the midsole, the PUMA FastTrac Nitro 3 in Smokey GrayFlame FlickerPuma Black offers a smooth and propulsive feel as you take on the challenges of the trail. The PUMA FastTrac Nitro 3 lets you explore any terrain at speed, thanks to its 4mm lugs and PUMAGRIP ATR rubber compound, that is designed to give grip even on icy, muddy or unstable conditions.An engineered mesh upper uses targeted PWRTAPE reinforcement to increase support and durability. The fit has also been updated for the perfect fit, whatever your foot shape. Stack height 31 23mmHeel drop 8mm4mm lug depthNITROFOAM Advanced nitrogeninjected foam designed to provide superior responsiveness and cushioning in a lightweight packagePUMAGRIP ATR Trailready performance rubber compound designed for traction on ice, mud, and unstable surfacesPWRTAPE Targeted upper reinforcement for support and durabilityEngineered mesh upperUpdated running lastRecommended for neutral pronatorsLifespan 800kmLining 100 Textile Outsole 100 Rubber Upper 73.57 Textile, 26.43 Synthetic Sockliner 100 Textile. The trainers fit true to size and have a standard fit, available in sizes 6 - 12. They feature a lace-up fastening, a pull-on tab to the back, and a mesh upper with a trail-ready outsole.