Features of the Merrell Women's Siren 2 Wrap Suede and mesh Upper Hook and loop closure system for quick adjustability Neoprene lining for padded comfort Merrell Air Cushion in the heel absorbs shock and adds stability Women's-specific Q FORM 2 Dual-Density Midsole provides light pronation relief M-Select GRIP Outsole tunes each Outsole with durable traction that grips when and where you need it 3.0mm lug depth