MATERIALl: Thermal underwear set is made of ultra-soft polyester that feels cozily soft, is completely non-irritating, and keeps you comfortably warm to beat the chilly weather. | BREATHABILITY: Breathable fabric is perfect to keep sweat away. At the same time, the lightweight thermal clothing maintains your body heat at a cool temperature by wicking moisture away from your skin. | STRETCHABLE: Four-way stretch and gives you the needed warmth without thick or heavy layers. The suit can be repeatedly washed without shrinking. Machine wash. | FEATURE: This women long underwear to keep you toasty without being too bulky. You can easily slip your daytime clothes or pajamas over the thermal base layer, . Tights or shirt can be used as base layer or worn alone. | APPLICATION: Ladies extreme ultralight warmest top and tights Sets makes your favorite cold weather activities more pleasant. Whether you are hiking, biking, hunting, snowboard, ski and camping or other outdoor.