From Nike, the Free 5.0 Flash girls' running shoes feature:

• breathable mesh upper
• designed to maximize a foot's natural range of motion while providing protection and cushioning for a smooth ride
• asymmetrical lacing system to reduce pressure and enhance comfort
• inner sleeve construction offers a snug, sock-like fit
• minimalist, molded sockliner mimics the curves of the foot delivering support and superior fit
• low-profile midsole doubles as outsole with deep flex grooves designed to maximize the natural range of motion