Text: We can't waste time."  The nights were chill and the cold made them huddle turtle fashion into the upturned collars of their short riding coats and jam their hats down as far as possible on their heads.
Entailment: The bundled down in the cold nights, upturning their collars and covering their heads to stay warm.
Contradiction: The nights were so hot they could not sleep. They stripped down to help cool off.