The combination of two foam types used in the Rebel shoes provides an excellent running feel. Compared to the V4 version, this V5 feels slightly softerthe previous version was primarily focused on bounce. The sole thickness has increased by about five millimeters, which improves shock absorption. The outsole now includes slightly more durable rubber. The ankle collar has been padded more than before. The Fuel Cell Rebel V5 is a very versatile running shoe. It's a great choice for interval training, daily runs, and even races. - Regular fit but with just a bit extra room for the front foot - Updated upper: the fabric now fits more snugly - Updated, relatively thin tongue blends better into the shoe - Suitable for neutral gait - Flexible sole allows natural foot motion during stride - FuelCell cushioning combines PEBA and EVA foams - Sole thickness: 35 mm at the heel, 29 mm at the forefoot - 6 mm drop helps direct power forward This model is not recommended for those who need arch