Abstract: A temperature controlling seat cover with a first flexible mesh fabric layer, an open cell flexible foam layer, a second flexible mesh fabric layer and a flexible binding strip. The open cell foam layer resides between the first mesh layer and the second mesh layer. The binding strip is sewn along the perimeter of the fabric layers. The resulting fabric and foam assembly forms a leg, buttock and back supporting mat whose perimeter is contoured to fit onto a standard baby seat. The mesh and foam construction allows for the passage of surrounding air to travel through the seat cover and to reach the back and leg portions of a person sitting in a seat that is covered by the seat cover. The seat cover is easily attachable or removable from a standard seat. A preferred embodiment includes a pocket containing a cooling or warming device.