The 2XU Thermal Compression Baselayer Tights provide warmth and muscle support while you ski. The compression fit promotes better blood flow, to speed recovery time are reduce soreness. The synthetic material is breathable and great at managing moisture, so it keeps you dry and very warm. This is the thermal version, so the inside is brushed to hold onto even more warmth. For added convenience 2XU thermals are anti-microbial. This means you can wear them for more than one day before washing.