Therapeutic Dimensions, Inc.-RM-ST Therapeutic Rangemaster Off-The-Neck Slingthing™ Arm Sling AdapterTherapeutic Dimensions, Inc. . Patent Pending RangeMaster Off the Neck SlingThing is a versatile sling adapter that works with most shoulder slings, offering an adjustable and effective tool to get your sling off your neck and enhance your recovery journey. Dramatically reduce neck pain, discomfort, and inflammation associated with a shoulder sling. One size fits most.