This is an older Slytech 2nd ski back protector. Size M/L. My son was involved with Slytech, and this was the second generation of the back pads. My hunch is that it's about 4 seasons old, but it's in very good shape. He got it for our daughter, and it was just too big for her. Subsequently got her a smaller one, and this one's been sitting in the closet. Not as fancy as the latest models, but still very effective, very protective.
How about $35, shipped? Please PM with questions. See pics below.