A surgical cast venting device comprises two elongate strips or two layers of flexible material at least one of which is porous. The strips or layers are spaced apart from each other and extend parallel to each other. Flexible, solid spacer members are arranged between the two strips or layers and connect them together. These members form air passageways between adjacent spacers so that air is normally free to pass along the passageways. A moisture-absorbent fabric layer extends along an outer side of the porous strip or layer opposite the spacers. In an alternate version, there is a first strip which is porous and a series of substantially flat, flexible outer members arranged in a row from one end of the strip to an opposite end. The outer members are spaced from the strip and opposite side edges of the strip and of the outer members are aligned with one another.
