Thank you for viewing. This is the "Like a Kotatsu Sleep Switch," which has a heat-retaining effect. It's perfect for those who can't sleep due to cold feet. I tried wearing it to see if I preferred the ones without toes, but I still prefer having my toes covered, so I'm hoping someone else will give them a try. I washed them after trying them on once. They've only been worn once, so I think they're in good condition. Thank you for your consideration. - Color: Gray - Size: 22-25cm - Model Name: Oyasumi Switch (Sleep Switch) - Material: Acrylic, Nylon, Others - Function: Heat retention, Cold対策 (Cold countermeasure)