The Pro-Sorb System offers a unique combination - all the benefits of a luxury Merino lambskin half-pad with the flexibility to adjust saddle fit and balance. No need to put additional gel and foam saddle & riser pads on top as a second layer, which can often slip and be hard to place accurately. Pro-Sorb gives you multiple choices in one product.Memory foam pads slide easily under the lambskin. These insert pads cover the main weight bearing areas offering additional absorption and padding. Use as a raiser pad for the front or back of the saddle. 9mm and 13mm insert pads allow for more accurate adjustments.Flexibility to adjust to changing shape of horses or different saddles - especially if a number of horses share the same saddle.The neat low profile nature of the Pro-Sorb avoids distorting the fit of the saddle if just additional padding is requiredNatural breathability and wicking effect of lambskin together with the light foam pads ensures minimal heat & sweat build-upFull set of four 13mm insert pads included. (9mm are also available as an additonal item).