Socks Supplement: Just Like a Kotatsu, Sleep Switch Color: Lavender Size: 22-25cm I am selling these because my parents didn't use them when I gave them as a New Year's gift, and I also have several pairs at home. Product Description: From the "Warm Like You Were There" series, which warms your body from your feet with patented technology, comes a sleep-time version. For those who can't sleep because their feet are cold, or who are anxious about having to sleep, these socks have three sleep switches to warm your feet and wrap you in a warmth that feels just like a kotatsu.