Poliyou is a high density PU foam that will provide better shoe environment to the user. Characteristics are: breathable, odor-free, anti-fungus, anti-bacteria, good compression set, wicks moisture, and the hardness can be made according to customers' different needs!  Many big brands like Nike, Ecco, Arbesko, Rockport have used Poliyou and have gave positive feedback. Used breathable Poliyou can made your shoes better!!