Merrell Women's Solo Origins Perforated unknown Strobel construction offers flexibility and comfort Waxy leather and perforated canvas upper Breathable mesh lining treated with Aegis antimicrobial solution resists odor 10% recycled EVA dual density footbed covered with mesh and treated with Aegis antimicrobial solution Merrell air cushion in the heel absorbs shock and adds stability with an EVA midsole for cushioning