Polypropylene Thermal Underwear provides the ultimate solution in keeping you perspiration free, warm and comfortable, by wicking away moisture from the body as you enjoy your favourite winter sport or just travelling in colder climates. Tough and hardwearing Sportztrek thermals offer maximum performance with ease of movement and without the sacrifice of comfort. Sportztrek use one of the softest yarns in the world to produce simple, fast drying and thermally efficient underwear. Its hydrophobic (water-hating) fabric wicks the moisture away from the skin quickly and efficiently to the next layer of clothing helping keep you dry and warm. The skin maintains a more constant temperature during strenuous activities than polyester and is an ideal choice for outdoor, sporting and leisure activities. This thermal top will meet the mandatory gear requirements of most ultramarathon races including The Guzzler Ultra, Ultra-Trail Australia and more.