Almost good.
Purchased this 1 week after shoulder surgery to repair a torn labrum. I order a medium.  For reference,  5'5 163lbs athletic build. Its supposed to be for left or right arm, but I don't think its for the left side. The biggest thing is the waist strap. When you wear it on the left side, the waist strap cut across where your hand would be resting making it uncomfortable.  Otherwise, i think this would be a good sling for recovery.
Rating: 3 stars