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)
Introduction to sweating. Sweat is a clear, odourless solution secreted by sweat glands, which are also known as sudoriferous glands. It is hypotonic, meaning that it has a lower concentration of electrolytes than the cells of the sweat glands.