Our Men's Thermals range comprises a wide Patra has increased the range of thermal underwear offering you Pure Silk Thermal Underwear, Silk Thermals and Bamboo Thermal Underwear. Our thermals are lightweight and will keep your temperature regulated, so whether you're outside or at home or at the office, you'll never be too cold or too hot. We have a wide range of men's thermals, as well as silk balaclavas, neck warmers and socks.