Red Barn Rubber Stall Mats are made from vulcanized rubber that doesn’t retain odors. The mats have a flat bottom that minimizes urine accumulation, while polyurethane mats absorb animal fluids which cause the binder to deteriorate. The fluids trapped in poly mats can cause bacteria and foul odors. You can also add shavings or saw dust on top of the horse stall mats; just remove the shavings or saw dust as needed to keep the stall clean.