These leggings are made from a combination of Spandex (10%) and Polypropylene (90%) offering a perfect layering material. Normal Lycra materials are cooling layers designed to cool the body, this garment has the outward appearance of Lycra but has a brushed ´fleece like´ inside to provide good thermal qualities. It also remains remarkably dry as the polypropylene material just hates water. Wear it under neoprene wetsuits, our Race Skin, our Dry Suit....... in fact the possibilities are endless - these leggings would be great under your ski suit, down the gym, cycling etc. 
Also available as a long sleeve top and socks.