It's an update on the original mesh design with a thin, flexible layer that helps keep out debris. The Nike Ace Summerlite Shoes got micro-suede lining so you can wear them without socks and the new integrated traction pattern keeps the design as lightweight as possible—without sacrificing grip.Features:LightweightBreathableMicro-suede liningFull-length Fitsole insert and foam midsoleNew integrated traction pattern places tooth-like traction along the perimeter of the shoe