This is a serious foot and sole health product, designed by a chiropractor! Walking in these will help you stand up straight! I've worn them indoors about 3 times, and I felt my posture improve with each step! I'm selling these because I bought other indoor sandals. I'd like to pass them on to someone who wants to try them! The entire product has been disinfected with alcohol! Sandals - Unisex Color: Gray Size: L (24.5-25cm) Please understand that these are used and have been stored at home before purchasing!