If you're a thrifty shopper, this Diesel Beanie will fit the bill. It's a fail-safe choice, while not very expensive. In this price range, you can also consider this Diesel Hat. It's also a popular item and won't break the bank.
If you can afford to spend a little more, why not consider this Diesel Beanie Hat. While the price is very reasonable, this item is an easy wardrobe update.