The Voltaire half pad is made of natural felt to absorb sweat and dissipate heat. Inside the felt, there is a layer of shock absorbing foam to protect the back of the horse during the flat and over fences. The half pad is available in: Medium (Fits - 16.5 to 18" Seats) Large (Fits - 18" and above Seats)It can come in Standard or with a front wither riser (B10), or a back riser (D10) The Voltaire half pad is made of natural felt to absorb sweat and dissipate heat. Inside the felt, there is a layer of shock absorbing foam to protect the back of the horse during the flat and over fences. The half pad is available in: Medium (Fits - 16.5 to 18" Seats) Large (Fits - 18" and above Seats)It can come in Standard or with a front wither riser (B10), or a back riser (D10)