The objective of the EU-funded research project Noterefiga was to develop novel temperature regulating fibers and innovative textile products for thermal management and improved comfort. The temperature regulating effect was achieved by novel methods of incorporating large amounts of phase changing materials (PCM) in textile fibers. The PCM melted and absorbed the heat from the body in the form of latent heat when the body temperature increased. The PCM crystallized and the stored heat was released again when the temperature dropped. It was assumed that clothes with built-in thermo-regulating properties would provide maintained thermal comfort in difficult thermal environments and physical activity situations. The thermophysiological effect of the developed PCM garments were evaluated on 24 human subjects in controlled environmental conditions under the Noterefiga project.