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)
What sets cold sweats apart from regular sweating is what the patient is doing when they start. You would expect to sweat after doing a few jumping jacks or push-ups, but cold sweats come on suddenly and at any temperature. Sometimes the sweating happens at night when the patient is trying to sleep.