How to Wear a Sling Slings are classified into two types: those used to treat forearm injuries and those used to treat collarbone or shoulder injuries. You can wear either type of sling, but it must be worn in accordance with our guidelines. If you have a forearm injury, you will need to wear a surgical-style cast. This type of sling prevents movement of the injured arm and allows the skin to heal. You will receive instructions on how to put on a surgical-style cast from your physician. If you have a collarbone or shoulder injury, you will need to wear a sling to support the upper body while your bone heals. These slings are not as restrictive as a surgical-style cast and allow you to carry out normal daily activities. You will receive instructions on how to put on a traditional sling from your physician. Some people may ask themselves why they would want to wear a sling if it restricts their movement. Wearing a sling can be helpful after you have healed from surgery or if you suffer from chronic pain. A sling provides support for the injured area until it is time to remove it.