The temperature on the thermostat is a discussion in many households, and Missy Bye, an apparel design professor at the University of Minnesota’s College of Design, has some tips for how to stay warm while turning the furnace down.

Bye says the most important thing is to dress in layers.

“Air is what keeps you warm,” she said. “It might sound a little odd, but the more air you can trap around your body, the warmer you’ll be. Lots of times, several light layers will be warmer than one heavy layer.”

She also suggests keeping your head and wrists covered.

“Your wrists actually lose a lot of heat. And it’s actually a way to cool yourself off if you’re really hot as to run cold water on your wrists. But those fingerless gloves are really great to wear in the winter,” Bye said.

As far as materials go, it’s similar advice: Anything that will trap air will work.

“So things that have some loft or thickness to them, like a sweatshirt or or a fleece generally is going to trap air,” she said. “If you can grab a layer with wool or a wool blend, wool naturally traps air in the fibers. And so it’s really great at regulating body temperature and keeping you warm.”

If you’re going to be active, Bye recommends a wicking layer to draw moisture away from the skin.