Nike Air Max Dn NIKE AIR MAX Dn Japan Domestic Genuine Product Size: Men's US4: 23.0cm Product Number: DV3337-300 Color: Olive Flak/Black/Olive Flak/Gym Red 【Condition】 Condition: Brand new, unused domestic Japanese product with black tag, without box. The new history of Air begins here. The unique Dynamic Air unit system uses two sets of dual-pressure tubes. The pressure is adjusted so that the heel area is the firmest and the midfoot area is the softest. When you step, the amount of air in the tubes changes, providing a smooth foot strike.