In the development of the high-performance knitted fabric HT3, the main focus was on providing the wearers of cleanroom undergarments with a material that can develop both slight cooling effects when required, but also has a heat-insulating effect in the opposite direction when necessary. Special hollow fibres (Thermo°Cool Fresh™ technology) are used for this purpose. With HT3, too, silver ions are firmly (non-migrating) incorporated into the synthetic fibres. Thus, like HT2, HT3 has an antimicrobial effect, i.e. germ growth on/in the textile is hindered and possible odour nuisance is reduced. With the additional use of elastane fibre, the wearing comfort properties (especially haptics and elasticity) are significantly improved once again.