Description from Knitty.com:

Calorimetry is a scientific term describing the measurement of heat lost or gained.

Knit hats are a wonderful way to block out the cold, but when you have long hair it usually requires wearing it down, not often the most comfortable option on a blustery day. This headscarf allows you to wear your hair up while keeping your ears warm and preventing heat from escaping from the top of your head.

My friend Meredith wears hers all around San Francisco and is modeling it here on the Big Sur coast. This can be knit quickly for a last minute gift, and as it only requires one skein of yarn you can afford to knit one for all of your friends.