Here's what other sites are saying:
Sure, thin, lightweight tights offer plenty of freedom to move, but sometimes on a truly-chilly day, you want a thicker fleece tight. That's where the Norrona Women's Trollveggen Warm2 Stretch Tight comes in. Thicker, midweight fleece is stretch-knit for both warmth and mobility, and perspiration is still free to evaporate away. Layer this tight under shell pants for skiing, boarding, or mountaineering, or wear it alone for cool-weather climbing.