the Headrest gel used for those cases that the position on spine, as rhinoplasty, General surgery cases, it helps the patient to be save and will not get pain after surgery because of the position of surgery.
Pron position Gel used for those cases that the position must be Pron as disc Tomy or spinal fixation or pcnl and other cases that the position is Pron, it's also used to health of patient to be save with all effect sides of position.