These days some modern designs are being made by adding cotton and silk with wool. This allows wool to be spanned more easily and allows the designers to make some more attractive designs. For outdoor rugs, you should not spend too much money and rely on synthetic materials. Synthetic materials are readily available these days and they are lot less expensive. You cannot place these synthetic material rugs inside the house because they carry some toxic agents that can react with your kid’s skin or your pet’s skin too. These synthetically manufactured rugs are also very long lasting and they can sustain through harsh weather conditions that they have to face in outskirts of your house.