As a result of the open structure of the Ventisit, there is a layer of air between you and the seat.
For optimal ventilation the Ventisit must not be covered. It is best if the Ventisit is slightly longer and/or bigger than the seat and that the sides are not covered by materials and/or clothes. Openings in the seat or a mesh seat will increase the ventilation capacity even further.
The Ventisit cushion provides a cooler seat in summer and quickly feels warm during the colder periods.