Please answer the following question: Extract the answer to the question from the following context. Question: What material used with horses is a result of the softening effect? Context: The general effect of the water content upon the wood substance is to render it softer and more pliable. A similar effect of common observation is in the softening action of water on rawhide, paper, or cloth. Within certain limits, the greater the water content, the greater its softening effect.
Answer:
rawhide