Highlander Thermo Tech base layers are designed for medium to high impact activities. The Thermo Tech base layer fabric is made from a combination of polyamide, polyester and spandex providing a close, comfortable compression fit. The Thermo Tech base layers are high wicking and absorb moisture away from the body to help keep you warm and dry but are also quick drying to help keep you warm during recovery. Ideal for outdoor activities such as cycling and running during the colder months of the year.