Coolmax Fresh Air is Sensor's lightest functional underwear , designed especially for active movement in warm weather or indoor sports. The Coolmax material from which this thermal underwear is made is a certified knit from Advansa , with excellent moisture wicking, antibacterial treatment and excellent shape stability and elasticity. In addition, Coolmax fibres are enriched with silver ions that break down the cell wall of microorganisms and prevent odours. Coolmax underwear is equipped with comfortable flat seams.