Love these shoes. Discovered these shoes years ago. I had heard good things about the brand Birkenstock. I have wide feet with high insteps but my left also flexed/flattened with walking. My feet use to always hurt at the end of the day. No matter what orthotic I used. But the hard insoles were initially a shock and I almost returned them outright. But instead I gave them a chance and tried them out for a few days around the house. I fell in love. My feet stopped hurting. I wear them 24/7 in the house and outside whenever the occasion is appropriate. I slip them on for long car trips. When I return home after a long day of work, I immediately put on my Birkenstock Madrids and my foot pain is gone in 15-30 minutes. The Madrids are my favorites because of my high insteps. The strap fits just below my toes in the perfect spot. Many slip on shoes I can't wear because the top of my foot has a high arch. I also like the look of the one strap and big buckle. I get many compliments. I do housework wearing them, laundry, cook, and up and down steps and no problem with them slipping off. I always have a separated pair for home and always have other pairs for travel, dress, etc. My extra wide feet fit in size Regular. I hope they never stop making the Madrid.