the fin is firm and slightly pliable enabling the fin to follow the contours of the slot which may be curved it may also be rigid preferably the fin is also essentially flat as shown in fig3 the fin can also have friction enhancing means such as grooves 35 which increase the frictional engagement with the slot the fin is attached substantially centrally to the surface opposite the body resting surface distributing the pressures on the fin and pillow uniformly this reduces disalignment of the pillow in use in a preferred embodiment the fabric of the outer casing 25 extends into the fin 20 through the seam 40 this seam provides the hinge that enables the pillow to swing freely in either direction against the opposite sides of the fin the hinge assists in avoiding tearing at the seam as well as allowing for the easy adjustment of the pillow while the fin is secured in the slot a disposable version of the pillow 10 can also be made wherein the outer casing 25 is a paper mesh like material and the fin 20 can be stiff paper such as cardboard the stuffing or compressible material would also be made of an inexpensive material the disposable pillow can be used commercially in planes trains buses and automobiles the seats in these forms of transportation may require an adapter such as a strap or pocket to accept the placement of the fin 20 the disposable pillow could also be used in hospitals for use on elevated beds fig4 shows the pillow 10 inserted vertically into a slot or.