adidas Solar Glide ST Women's Running Shoes Purple Tint/Boost Blue Violet/Tech Indig : Introducing the evolution of BOOSTA(R) technology with the adidasA(R) SOLAR GLIDE ST running shoes. This guidance-focused design features a SOLAR PROPULSION RAIL that works with the energized boost to provide a smooth, stable run. ENERGIZED STABILITY comes from a firmer boost placed on the medial side of the shoe that promotes a guided footstrike during the run. Shoe Technology Upper: ENGINEERED MESH upper around the forefoot provides breathable, flexible comfort and medial support. A supportive heel FIT COUNTER enables the free movement of the Achilles tendon. Midsole: Full-length BOOSTA(R) midsole provides unmatched energy return and superior cushioning. Includes ENERGIZED STABILITY from a firmer boost on the medial side that provides the added stability to guide the foot from heel strike to toe off. TORSIONA(R) SYSTEM provides stability and propulsion throughout the midfoot phase of the gait cycle. Outsole: STRETCHWEB with CONTINENTAL(TM) rubber outsole with superior grip that adapts to every runner's foot strike by moving in harmony with BOOST to provide a smoother and more flexible ride.