The unisex   running shoes in core black, zero meralic, and spark are made to optimize running efficiency and feature STRUNG uppers, a textile innovation that transforms athlete data into a dynamic material tuned to the athlete's needs, 3 layers of LIGHTSTRIKE PRO, in a stack height of 50mm, two layers of foam to reduce weight and provide spring in the fore- and midfoot, and an outsole featuring Continental compound delivering serious grip on a variety of surfaces.