A company called Surfline Hawaii originated and trademarked "Jams" in the mid to late '60s. These were the original unlined board shorts, with a pocket for surfboard wax. They were longer than other shorts, dropping to the lower thigh, and designed to ride low on the hips. The longer leg length prevented chafing while sitting on a board waiting for waves. They were made of cotton, so did not dry quickly.
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