Unique combination of luxurious lambskin Half-Pad with flexibility to create a front or rear riser using closed-cell foam inserts under the wool or for additional shock absorption. Adjusts to changing body shape or different saddles. Swan-Neck and clear-spine relieves pressure, allows air flow and improves fit. Set of 4, 10mm pads, with additional 6mm insert pads included. Medium: 16"-17". Large: 17.5"-18.5".