Boucle can be made out of a lot of different things, but I would say if you're not used to working with it try something acrylic, like Bernat soft boucle yarn. As an acrylic, it can be machine washed and is very durable.
cold sweat - the physical condition of concurrent perspiration and chill; associated with fear. fear, fearfulness, fright - an emotion experienced in anticipation of some specific pain or danger (usually accompanied by a desire to flee or fight)
Night sweats may indicate hidden infection in the body, an autoimmune digestive disease such as Chron's, or the presence of malignant tumors or leukemia. More commonly, night sweats are a result of hormonal imbalance or the side effects of medications.