If the socks have not been worn, it is generally safe to wear them twice before washing them, as long as they are still clean and free of any dirt, sweat, or odor. However, there are a few factors to consider:
Personal hygiene: If you have clean feet and your socks remain clean and odor-free after the first wear, wearing them a second time should be fine. However, if you have sweaty feet or any foot-related issues, it's better to wash them after each wear.
Environmental conditions: Hot and humid weather can lead to more sweat and bacteria buildup, which might make it less hygienic to wear socks multiple times.
Material of socks: Some materials, like cotton, tend to absorb and retain more moisture, while others, like moisture-wicking synthetic blends, can help keep your feet drier and cleaner.
Comfort: Even if the socks are technically clean, some people might find that wearing them multiple times without washing causes discomfort or irritation.
In general, it's a good practice to alternate between different pairs of socks, allowing each pair to air out and dry between wears. This helps prevent excessive wear on a single pair and can extend their lifespan. Remember, if the socks become visibly dirty, smelly, or uncomfortable, it's time to wash them regardless of the number of wears.