Chemical, biological, radiological and nuclear - CBRN equipment is used by military and civil staff in harsh environmental conditions. These suits intend to isolate the user from the surrounding environment, thus also isolating the suit from heat and mass transfer processes, turning humidity regulation and thermal management very difficult to achieve in this kind of equipment. This leads to thermal stress, hyperthermia, cardiac alterations and even to the collapse of the user of the equipment. Some solutions are very limited to the torso and are quite bulky and may further increase the weight of the equipment. In this work, a type of garment will be designed with features that enable the dissipation of the extra metabolic heat by a cooling fluid that will circulate inside a network of several microchannels based heat sinks, embedded in that garment, with no significant increase in the weight of the equipment. The microchannel heat exchangers were optimized to have thermophysical and geometrical characteristics that make heat dissipation as efficient as possible, increasing the overall heat transfer coefficient for a minimum pressure drop. The distribution of the heat sinks throughout the various regions of the body is also addressed in this work. After this optimization, a microchannel heat sink was produced from addictive manufacturing (stereolithography) and was experimentally tested. The experiments consider the characterization of the flow and of the heat transfer processes, using high-speed thermography. Pressure drop measurements are further processed to complement the data obtained. The results evidence a good performance of the devised heat sinks for single phase working conditions.