Abstract: An infant mask is disclosed having contoured features in relief held in place by a nipple inserted in the infant's mouth. In one embodiment, the contoured mask is removably connected to the nipple. In a second embodiment the mask is made to change shapes as a result of pressure applied to the nipple.

Abstract: An energy exchange wheel having a wrapping hub which surrounds, and is concentric with but spaced from a central hub; an axially perforate matrix of energy exchange material around the wrapping hub; and a rim around the matrix. The axial dimensions of the central hub and the matrix correspond to the wheel depth, the axial dimension of the wrapping hub is between one-quarter and one-half of the wheel depth, and the axial dimension of the rim is at least equal to the axial dimension of the wrapping hub but less than the wheel depth. Tilted bar-like spokes secured to the central and wrapping hubs and to the rim prevent axial movement of the matrix.