A padded zone on the heel and ankle helps to protect the Achilles tendon, and there's very comfortable padding on the toe and ball of foot areas too. Ventilation zones on the top of the foot area increase breathability and help keep the feet feeling cool during wear. Covered by 1000 Mile's unique BLISTER FREE GUARANTEE - Double layer construction helps to eliminate friction between the foot and shoe, reducing wear and helping to prevent blisters.Made from recycled plastic bottlesPadded zonesVentilation zonesDouble-layer construction to prevent blisters