K-Swiss Women's Tubes Run 100 A Running Shoe 100% Textile Rubber sole Durability is achieved with a full length Aosta II rubber outsole Flexibility is enhanced by anatomically correct flex-grooves Breathability is increased with a mesh upper Cushioning is provided by k-EVA midsole compound and the dynamic motion of the tubes working in harmony with the motion of the foot Stay-Tied Laces act as a "catch" to keep the laces tied through your entire run