Stedi Tred® fall prevention slipper has a dual tread design and the comfortable feel of a slipper. It is a slipper that can be worn all the time. XX-Large is equivalent to Mens 11+, Womens 12+; X-Large is equivalent to Mens 9-11, Womens 10-12; and Large is equivalent to Mens 8-9, Womens 8-10.