Hollow pillow with a concave top and a grooved bottom

摘要

An elastomeric pillow (1) includes a concave top surface (11); a bottom surface (14) comprising a transverse groove (13) with two open ends; and a hollow (12) for circulation being in communication with the top surface (11) and the groove (13). The hollow (12) is not centered with respect to each of the groove (13) and the top surface (11).