Brand new Sleep Number Flextop King sheet set with flat, fitted, and 2 pillow cases. Still folded in carrying case. Set has 37.5 Technology for Temperature regulation which absorbs excess heat to cool you down and releases it to warm you up. 76% cotton, 22% 37.5 polyester, 2% spandex. 300 thread count sateen weave. Machine washable. Sleep Number site lists $329. This item is over 5 lbs, but I will cover the overcharge fee.