Made of high density polyethyleneplastic with a foam lining for comfort and rigidity. Stacks flat to preserve space. Adjusts to different heights with locking tabs. X-ray CT and MRI lucent Adult Size, 11" - 23" Circumference. Specifications: Adjustable: Yes Latex Free: Yes Material: Poly/Foam Max Length Inches: 18 in Min Length Inches: 8 in Patient Type: Pediatric Size: Universal Style Detail: Trach Opening