Felt hats are usually softer in their construction than straw hats although stiffeners are some times added for effect. Felts come in a variety of types, colors, patterns and finishes. Most felts come from the Czech Republic. Felt hats help keep you warm in cool weather and have some natural water repellency. However, excessive moisture and heat can change the character and shape of both felt and straw hats and their trimmings.