The /dev/blankets are 85% virgin acrylic and 15% polyester, making them nice and warm. Cover up with one on a cold night while you code; We certainly have! The durable jacquard weaving of the /dev/blanket makes it strong enough to withstand use and abuse, and the low cost lets you pile /dev/blankets high on your bed for the winter, and put them away in the spring and summer. We sleep with one on our beds year round! Got a midnight thirst? Wrap up in your /dev/blanket and head to the kitchen for some warm milk.