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 - the process of the sweat glands of the skin secreting a salty fluid; perspiration is a homeostatic process. diaphoresis, hidrosis, sudation, perspiration. bodily function, bodily process, body process, activity - an organic process that takes place in the body; respiratory activity.