A U-sling is a standard quick-fit, universal sling that works for most of the patients approx. 85%. It is available in all sizes from XS to XL. U-sling is the easiest sling to use for wheelchair transfers because the bottom is open and the patient does not sit on the sling. Simply pull the back support down behind the patient''s back and the long leg straps wrap around the thighs of the patient.