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)
Sweat is defined as to perspire by releasing moisture from the surface or pores of the skin. An example of to sweat is a person's shirt being wet after they've run a five-mile race. or sweatâ²ed, sweatâ²ing. to give forth a characteristic salty moisture through the pores of the skin; perspire.