Reference MSM1B-ST The size is MS and it is a square toe design. Darco MedSurg Pediatric Post Surgery Care Orthotic Boot. This boot can be worn with a cast very comfortably, bought but never used, this size would fit up to a women's size 4 UK. This is a healing shoe can be used indoors or outdoors and can fit the left or right foot comfortably. Brand new with tags.