U-shaped with Polyurethane foam. Snap-closure restraining strap helps make transportation easy as well as keeping pillow in place when in use. Manufacturer Warranty: 3 Year Measurements: 11.75 Length/Inches, 12.25 Width/Inches, 4 Height/Inches Weight (lb.): 0.5 Lb Base Material: 100% Polyester Filling Content: 100% Poly-Foam Care: Machine Washable Cover Country of Origin: Imported