ACE Brand Arm Sling, Adjustable, Gray, 1/Pack. When you've got to protect an arm or elbow injury, the ACE Brand Arm Sling does it with comfort, adjustability and effectiveness. Soft padding around the shoulder makes it more comfortable and the thumb loop holds your hand in the ideal position for healing. When you've got to protect an arm or elbow injury, the ACE Brand Arm Sling does it with comfort, adjustability and effectiveness. Soft padding around the shoulder makes it more comfortable and the thumb loop holds your hand in the ideal position for healing.. One size - Adjustable, Thumb loop holds hand in ideal position, Adjustable, padded shoulder strap, Quick release buckle for easy removal, Not made with natural rubber latex