It was originally based on patient slippers that were used (provided) by medical institutions in the US military. Remake versions have been released by various brands, but most of them are made for compact foldable travel. Many of them are a little unreliable for daily use as a home. &NUT has a solid core material and a little cushioning to make it able to withstand heavy use. Product Description Originally based on slippers issued to patients at U.S. military medical facilities. While many modern remakes are designed as compact, foldable travel slippers, they often feel too lightweight for everyday use at home. At &NUT, we reinforced the structure with a solid inner core and light cushioning, creating a durable design built to withstand daily, heavy use while staying comfortable.