(Roma) This soft pillow pad, when folded over in the center, measures 5 1/2" thick. The curved design allows for a better fit and helps prevent slippage. The soft poly-cotton outer along with thick quilted polyfill make this a very comfortable pad. It is fully reversible to make this "two pads in one". The spine of the pad measures 22" and the bottom of pad 36" across the side of the horse at the bottom of the pad.