After purchasing from Stride Lab, I used it 5 times and then stored it. The size is M (25.5cm - 29cm). This is a listing for the main unit only. It will be shipped in this package via Yu-Packet Post Mini. Price is not negotiable. Please purchase if you understand that this is a used item. I have washed it before listing. ----- Gait Happens Toe Spacers are designed to support the natural spread of your toes and provide a comfortable fit. They are designed to be used with shoes that have a foot-shaped design, such as Altra, making them easy to incorporate into your daily life and when you're out and about. Using them with your weight on them helps your feet and toes return to their natural position. You can wear them directly on your bare feet, over five-finger socks, or even inside shoes with a foot-shaped toe box (i.e., ALTRA). Using them while moving, such as during running or walking (i.e., during your commute, at work, or while shopping), is the best way to return your toes to their natural position, not just while you sleep.