Yarn maker Rhodia has launched what it describes as an "intelligent" polyamide 6.6 yarn that can help regulate body temperature and improve circulation when used in sportswear or underwear.

The yarn, which has been branded Emana, incorporates a patented additive and was developed in Rhodia's R&D laboratories in Brazil.

According to scientific studies conducted by the Brazilian lab Kosmoscience, sportswear manufactured with Emana improves body thermo-regulation by 41% during exercise and reduces the accumulation of lactic acid, which leads to muscular fatigue, by 35%.

The same studies are also said to indicate enhanced comfort and a reduction in cellulite, with an 8% increase in skin elasticity.

The yarn's properties don't deteriorate after repeated washing and benefit from the key characteristics of polyamide, such as soft touch, easy care, resistance and elasticity.