The 'Chill' comforter is designed to feel cool to the touch all night while having the weight of a down comforter. The comforter is made using long-fibered linen and one millimeter copper beads. The use of copper beads is what keeps the blanket cool to the touch throughout the night because the beads are capable of dissipating heat much more efficiently than the thinnest cotton is capable of doing.
While the blanket is intended to keep the user from getting too warm while they sleep, the designers also wanted to craft a blanket that had the feel of a comforter. The Chill comforter is incredibly thin and easily fits inside of a duvet but doesn't slide around the way a typical comforter does.