Sierra Thermal || Eastern OliveThese thermals are one of our favorite winter wardrobe staples and we reach for them again and again as the temperatures drop. Waffle, or thermal, knits are known for their incredible ability to keep you warm with the lofty insulation they provide, trapping a small bit of air between your body and the material, allowing your heat to stay close and help you conserve energy. Thermals really are wonderful! 100% cotton milled in Los Angeles, California.