Active temperature control Developed by NASA for off-world applications, Outlast® technology actively regulates your body temperature despite changes in your environment, keeping you cool when the temperature rises or lessening the chill when it falls. This thermo-regulating know-how has been proven to effectively reduce perspiration by up to 33%. Tailored for comfort Walero race underwear has been tailored for a superior fit with flat-lock seams and super-soft fabric to ensure maximum ease of movement and palpable comfort from start to finish. Freshness beyond the finish line Treated with Envirotex, Walero next-to-skin base layers keep you fresher for longer meaning no more smelly kit bags either! This cutting-edge, hospital-grade antimicrobial is 99.999% effective against many common bacteria as well as many fungal spores and viruses, as well as being non-toxic and eco-friendly. Protection when needed Ready to face the unexpected, Walero base layers are quality-assured and have been tested and approved to FIA 8856-2000 and SFI 3.3, which means they are fully flame-retardant and fully approved for racing worldwide. Description: The most technologically advanced range of thermo-regulating base layers available. Fabric: Active Temperature Contol - Developed by NASA, Outlast® technology regulates body temperature and has been proven to reduce perspiration by up to 33% Tailored for Comfort - flatlock seams and super-soft fabric ensure maximum ease of movement and palpable comfort from start to finish Fabric Freshness - Treated with Fantex™, this cutting-edge, hospital-grade antimicrobial is 99.999% effective against many common bacteria as well as many fungal spores and viruses, as well as being non-toxic and eco-friendly Ultimate Protection - quality assured, tested and approved to FIA 8856-2000 and SFI 3.3, which means they are fully flame-retardant and fully approved for racing worldwide