Simple and Easy to Use – One size fits most design. Your Aspen Tx Collar easily adjusts to fit a variety of patients and conditions. The comfortable design makes it easy to ware all day without irritation for most patients. The Vista TX Cervical Collar from Aspen Medical encompasses all of the features and benefits of the Vista collar, but with a thoracic extension. Removable, foam laminated pads wick away moisture to ensure proper patient hygiene and comfort while preventing skin irritation. X-ray, CT and MRI lucent.