Check the listing for details. Toklat T3 Matrix Performance Shim Pad WoolBack Lining Impact Protection 31 x 30. Condition: New. Listed at 281.95 USD. He may not be a linebacker, but he deserves to be protected like one.The technology used to protect NFL players is now available to protect your horse. Introducing Toklat's T3 Performance Pads with Superior Impact Protection.Size 31x30Features include:An all-in-one pad with Impact Protection inserts AND shimsMachine washable and dryer safe! (Remove inserts and shims through velcro closure on spine prior to washing)Full length Impact Protection inserts cushion, protect, and absorb up to 90% of the energy transferred between horse and riderShims allow rider to adjust an imperfect saddle fit, or compensate for asymmetrical muscle development. Build up side to side or front to back, as neededDetailed shimming instructions can be found hereShim pad comes with three internal full-length pockets on either side of the spine, each pre-filled with two 1/4" customizable felt shims for a total of 12 shimsShims and Impact Protection inserts accessed through velcro closure on the spineA rugged non-slip military-grade fabric topperWoolBack lining: 100% natural virgin woolExtremely lightweight and breathableCorrectly placed cut-out for close-contact leg positionHigh profile for maximum wither clearanceErgonomic design for maximum freedom of movementWhat this means for your horse:A noticeably more comfortable back and rounded top lineAids in maintaining a healthy backWhat this means for you:A more secure seat and less bouncing in the saddleLess stress on back, knees, and anklesWARNING Cancer and Reproductive Harm -- www.P65Warnings.ca.gov