GUC. The brand depicted in the image is Nike, specifically the Air Zoom Pegasus 39 model. This shoe is known for being a reliable and durable all-rounder suitable for road running. It features a supportive design with underfoot cushioning and Zoom Air units for a responsive feel. The upper is made of breathable engineered mesh, and Flywire technology provides midfoot support. The outsole offers good grip on various surfaces. The colorway shown appears to be the "Gunsmoke" variant. Reviewers have noted the shoe's snug and comfortable fit, stability, and responsiveness, although some find the toe box narrow and the upper warm. The Nike Pegasus is a long-running series, with the Pegasus 40 and the upcoming Pegasus Premium building upon the features of the 39.