ULTRA BOOST ST SHOES - A LIGHT, LUXURIOUSLY CUSHIONED STABILITY SHOE FOR ANY PACE AND ANY DISTANCE. These limited-edition women's running shoes are the ultimate experience in luxurious stability. Whether you're training or running a full marathon, their plush boost midsole keeps every step charged with energy. An adaptive adidas Primeknit upper and ergonomic heel give lightweight support exactly where it's needed, and a STRETCHWEB outsole provides a smooth, stable heel-to-toe transition. A light, luxuriously cushioned stability shoe for any pace and any distance. Weight : 278 g (size UK 5.5) adidas Primeknit is carefully engineered to naturally expand with your foot while you run to give you a more comfortable fit and help reduce irritation. boost's energy-returning properties keep every step charged with an endless supply of light, fast energy. STRETCHWEB rubber outsole is lightweight and elastic, adapting to the ground for stability and working strategically to optimise the unique properties of boost from touchdown to push-off. TORSION SYSTEM for midfoot integrity; Ergonomic heel structure for added support.