A mesh liner provides additional breathability * EVA (ethyl vinyl acetate) Fit-Beds provide lightweight cushioning underfoot. EVA does not take a set, so the cushioning will remain the same for the life of the shoe * This soft density zone provides additional walking comfort and flexibility * EVA midsoles provide lightweight cushioning underfoot. EVA does not take a set, so the cushioning will remain constant for the life of the shoe * Creates a lightweight, durable and stable hitting platform