GEL-SONOMA 15-50 from Asics. This style harnesses inspiration from the 15-50™ cross-country spike’s upper. It was originally designed for competitive runners racing on a wide range of terrain. Now, it’s modified for maneuvering on city streets and mountain trails. The tooling uses components from the first two GEL-SONOMA™ trail shoes. From everyday foot traffic to hiking rocky hillsides, these features create advanced cushioning and traction in various surroundings.