I don't know if you can buy them, but I know that Olympic marathon qualifier Ryan Hall cut his own from underarmour, and my friend followed his example... You can definitely buy these from running and outdoor sports stores. Many runners wear them for UV protection. In addition they wick away moisture and, depending on the fabric, can have a cooling effect. In cold weather, they protect the arms from wind and UV rays, and provide greater freedom of motion than a full jacket.
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