Synthetic Overlays - For added support and secures the foot tightly onto the shoes. Engineered Mesh Overlays - Help's keep your feet cool and dry whilst you perform. Heel Collar and Padded Tongue - For improved comfort whilst you perform. Adidas BoostTM - Energy-returning properties keep every step charged with an endless supply of light, fast energy. Full-Length EVA Stable Frame - Designed to guide and support the foot from heel to toe.