Don't be fooled by the heavyweight Mega-grid thermal fleece, because the Under Armour Women's Base 4. 0 Leggings are surprisingly light for the amount warmth they hold. This insulating tight delivers four-way stretch for unhindered mobility, quick-drying comfort, and odor-resistant convenience. The wide waist band sits below the hips and resists binding or bunching. So, charge down the mountainside with these thermals under your ski pants when the snow is stacked, and then take 'em to the hiking trails when the melt comes, because you're going to need those quad muscles come next season.