It's generally not advisable to wear the same socks again without washing them, even in winter. Socks can accumulate bacteria, fungi and unpleasant odors throughout the day. By wearing them again without washing, you risk transferring these pathogens to your feet, which can lead to fungal infections or body odor. Socks worn repeatedly can become stiff, dull and less comfortable. Regular washing maintains their softness and elasticity, ensuring optimum comfort every time.