Duofold Women's Expedition Weight Two-Layer Thermal Ankle Length Bottoms #821C 100% Spandex Imported base-layer-underwear closure Machine wash cold with like colors. use only non-chlorine bleach when needed. no fabric softener. tumble dry low. do not iron. Bottoms incorporate a drawcord for a custom fit 360 stretch for maximum flexibility and optimum fit, excellent moisture management, quick drying and odor resistant TAGLESS for added comfort and flatlock seams to help avoid irritation