Researchers from National Armed Forces (NAF) of the Republic of Latvia in cooperation with researchers from Riga Technical University (RTU) have evaluated quality of the Combat Individual Protection System (CIPS) of the National Armed Forces of the Republic of Latvia for the functional replay of thermal resistance Rct, water vapour resistance Ret and water vapour permeability index im. In order to protect the soldier in cold weather environment, researchers divide the soldier’s body into the groups, such as the upper body (including arms without hands), lower part of the body (legs without feet), neck and head. Following level of compliance of the CIPS quality of maximum layering Rct=3 clo was indentified and fully compliant with requirements of the climatic region C0-C1 according to NATO AECTP-230 “Climatic conditions” area temperature –60C until –320C. Water vapour resistance identified within a range of 4.5 to 52.5 m2Pa/W depends on layering. Water vapour permeability index im identified within the range of 0.05 – 0.65 depends on layering. Future work plan has been established on increasing the quality level of CIPS to be compatible with C2-C4 climatic region.