Ug and his parents live in the Stone Age. And that means stone blankets, stone cold food, an even colder cave and, worst of all, hard stone trousers! Being an inquisitive and intelligent child, Ug suggests a series of modifications to improve the quality of family life. His ideas about heating, cooking, boats, and balls that actually bounce are initially met with a hostile reaction. But with the help of his father, who slowly comes round to his son's way of thinking, Ug comes tantalisingly close to his ultimate garment goal . . .