Weight: 184 g (size UK 5.5)boost™'s energy-returning properties keep every step charged with an endless supply of light, fast energySTRETCHWEB 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-offAllover graphic print upper; Synthetic sidewall panels for added stabilityWelded overlays for support and stability; Adaptive dynamic fit for optimal flexibilityRunner type: natural; Stack height: 25.5 mm / 16.5 mm (9 mm differential)