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Answer: Footer socks are made of high-density short-fiber cotton yarn that can develop small balls due to friction and heat. The toe area, especially in dark-colored socks, may accumulate more cotton yarn due to sweating. However, this is a normal process that does not impact the socks' structure or their ability to deodorize and wick away sweat. To help with this issue, we suggest washing the socks inside out multiple times, and the situation will gradually improve.