Stone Underpants : (Purple Early Reader)

The Stone Age is very cold and Pod needs something to warm his bottom He realises he needs a good pair of underpants but puzzles over what to make them from.Stone is too heavy, wood is too splintery, and mud is too yucky...Nothing seems to work In the end, a baby woolly mammoth gives Pod the inspiration he needs and he knits himself some very warm woollen underpants.Bring on the Wool Age