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1. A cushioning mat made of a thermoplastic material by injection moulding, comprising: a unibody having a plurality of cushioning bumps arranged in a plurality of rows, each row having the bumps alternating with substantially flat bottom portions, each bump comprising a top wall and a side wall extending from a mat base identified by said bottom portions, said top wall and said side wall defining an inner bump cavity, the bumps of adjacent rows being staggered with each other, the top walls of the bumps forming a yielding support surface for a user, wherein in at least a portion of each side wall a vent opening is made as a through opening which places in communication the inner bump cavity with the outside of the bump to provide air circulation, wherein the bumps of adjacent rows are at least partially superposed with each other at least along vertical planes which the vent openings lie on, and wherein superposition of corresponding portions of the bumps is present in an undeformed configuration, wherein each vent opening leads into a vent chamber that is completely open upwards from the flat bottom portion, inferiorly delimited by the bottom portion and laterally delimited by the side walls of the bumps adjacent to said bottom portion and wherein each of the plurality of cushioning bumps is fluidly connected with at least one vent chamber via the vent opening so that air flows between each of the plurality of cushioning bumps and a corresponding vent chamber independently from air flow between other cushioning bumps and their corresponding vent chambers.
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