1. MATERIALl: Thermal underwear set is made ofdacron that feels cozily soft,is completely non-irritating,and keeps you comfortably warm to beat the cold weather. 2. 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 3. 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 4. FEATURE: This 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. 5. APPLICATION: Men ultralight warmest top and tights Sets makes your favorite cold weather activities more pleasant. Product Description: Man Thermal Underwear setMaterial: dacronColor: blackSize: L,XL,XXLPackaging content: 1 set Man Thermal Underwear