Cushion portion for a seat

A cushion portion for a seat with an air-conditioning effect, comprising a basic element having a top side providing an opening therein, and a cover element which has a configuration adapted in respect of shape and dimension to the opening in the basic element and which is replaceably accommodated in said opening, said cover element having an underside which faces into said opening and which comprises a plurality of spaced-apart projections thereon, thereby defining a cavity means between said cover element and the adjoining surface of the opening in the basic element and between said spaced-apart projections, and said cover element being provided on its top side which is remote from the basic element with spaced-apart depressions and apertures disposed in said depressions, and extending through said cover element to provide a fluid communication with said cavity means, and wherein each of said depressions has a conically enlarging configuration toward said top side of said cover element, and further including spaced-apart outlet openings at the peripheral edge of said cover element and spaced-apart outlet openings at the peripheral edge of said basic element, said spaced-apart outlet openings of said cover element and said basic element providing a fluid communication with said cavity means.