Size 1: This is a small C-shaped headrest that helps provide additional support to the head and neck. A=4", B=3.5", C=5.5".

Size 2: This is a large C-shaped headrest that helps provide additional support to the head and neck. A=6", B=3.5", C=5.5".

Size 3: This is a larger headrest with extension flaps on the right and left sides to prevent the head from sliding sideways. A=4.5", B=3.5", C=6".

Size 4: This is the largest headrest that helps provide additional support to the head and neck. A=5.5”, B=3.5”, C=3”.