I bought the shoes for indoor use, because I need slippers inside because of my back. The shoes are really comfortable and seem to be back-friendly as well.
Verified buyer

With their sock-like fit, the Pure Freedom footwear allows your feet to work in a natural fashion. Your feet will get stronger and the effects can be felt from the toes all the way to your hips. They are also a great choice for gym use.
Start using barefoot wootwear gently: give your tendons and muscles time to recover from each exercise, as they are likely to be shocked the first time you wear these shoes.