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)
Sweating is a natural process that helps regulate the body's internal temperature, especially during exercise or hot weather. As sweat evaporates from the surface of your skin, it removes excess heat and helps to cool the body.