Puffin Gear's beautiful linen hats will not only keep you cool but are lined to provide protection from at least 97.5% broad spectrum UVA and UVB radiation. Linen is woven from eco-friendly natural fibres from the flax plant. Flax takes little or no chemical fertilizer to grow and once harvested all parts of the plant can be used. Linen is cool and very absorbent, perfect for hot summer days. Fabrics are prewashed and shrunk. It is best to hand wash and air dry your hat over a vase or jar.