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)
Pain: A person who is suffering from intense pain as a result of fractures or even migraines may experience a response in a form of cold sweats. Stress, anxiety, or fear: High stress, anxiety, or fear can trigger a fight-or-flight response, which can abnormally trigger the sweat glands to cause cold sweats.