For a stall with a concrete floor, rubber stall mats are recommended to provide cushion and reduce concussion on the horse. There will be urine leakage with any rubber mat you use. Drainage will also be an issue with concrete floors, especially if it is not a porous concrete that allows for drainage. The slope of the floor will also affect drainage and where those liquids go. You will have to deal with the drainage issue every day in order to maintain a clean, dry stall.
Heavy bedding is also recommended to further increase the shock absorption of the flooring and to absorb liquid waste. If you do not add rubber mats and heavy bedding to concrete stall flooring, your horses will become stiff and prone to lameness. Be sure that the stall mats fit well in the space to prevent slippage or movement. The mats themselves can be slippery if there is not adequate bedding for absorption of urine. Some rubber mats may be textured, but those can also become slick, and also should be heavily bedded.
