Positioned on the operating table before surgery the Full Access Underbody warming blanket provides unrestricted access to the patient for clinical flexibility. Two perforated apertures allow flexible patient positioning and the use of table accessories, enabling the warming blanket to be used for a variety of procedures. Fluid outlets help to keep the patient dry and minimize the cooling effect of excess fluids. A consistent perforation pattern provides even distribution of warm air to the patient. The perforated aperture at the head of the blanket can be removed to enable the use of a horseshoe headrest, providing a flexible warming solution. Adhesive strips and tuck flaps secure the blanket to the operating table reducing the likelihood of blanket movement during the procedure. Two pre-sealed hose ports at either end of the blanket enable versatile and convenient positioning of the temperature management unit. A generously sized clear head drape reduces heat loss around the patients head and arms without compromising visibility of the patient.