The PUMA Electrify Nitro 4 'Triple Black' treats the trail running shoe to a sleek monochrome makeover. Built with black engineered mesh, the upper features Formstrip branding on the lateral side panel. A matching black finish is applied to a dual-density midsole built with a combination of lightweight NITROFOAM and durable PROFOAM. Underfoot, a durable PUMAGRIP ATR rubber outsole provides multi-surface traction.