The Zen Slip On features Etc anti-friction mesh socklining with Dri-lex lining, Poron cushioning material strategically placed at the ball area to provide long lasting cushioning, an internally molded insert that features full length Ortholite polyurethane foam for breathability and cushioning, combined with a contoured dual density EVA wedge for shock absorption and aided foot alignment, exclusive BioBevel sole technology that enhances and encourages natural gait alignment and reduces fatigue, and a molded rubber cupsole for durability and flexibility.