All gel items contain self activating gel that has specially selected ingredients including jojoba oil, olive oil, vitamin E and lavender oil used for their hydrating and conditioning properties, locking in moisture. The gel heel covers and gel socks will turn dry feet into sandal ready stunners! With just 20 minutes a day, slide the socks on and let them do their magic. Reusable with a gentle hand wash in cold water and line dry in the shade, best to replace after 40 uses. One size fits most female size feet.