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 the release of a salty liquid from the body's sweat glands. This process is also called perspiration. Sweating is an essential function that helps your body stay cool. Sweat is commonly found under the arms, on the feet, and on the palms of the hands.