A word of warning... wash in hot ONLY if you have a difficult stain to remove. It's not advised for everyday washing.
Also, wool is pure animal hair. When it gets wet, it will emit a slight sheepy smell (think the smell of a petting zoo, but a mild scent), which is the lanolin on the fiber. When dry, it is not noticable. The more processed the yarn (making it washable, dying, etc), the less lanolin is left, and less smell. However, the lanolin is what gives it much of it's waterproof and warming qualities. It's a toss up. Personally, I like unprocessed wool.