If they are the tight fitting elasticized sleeves, which can be worn on the forearm (straight sleeve) or the elbow (angled sleeve), it is possible they are wearing them for warmth. As I understand it from my son, they help keep the muscles and joints warm by the heat generated by the body. He always wore one on his pitching elbow anytime he threw where the weather was cold.
We wearin' here too! Baseball players do not make fashion statements. Like FutureBack.mom said. it is worn to generate and retain heat to the joint(s).
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