The hat has a lining inside. Merino wool products are perfect for people who find regular wool itchy. Merino wool also helps to regulate body temperature: keeps you warm in winter and cool in summer. Another good feature of meriino wool is its fluid absorption capability but not feeling wet against the skin. No harmful or irritant chemicals used. Safe and healthy working conditions. Maintenance: gentle machine wash, max 30°C! We recommend washing merino wool products as infrequently as possible. After washing, the hat should be spread flat to dry. While drying, adjust the hat to the correct shape. You can lightly steam the hat. Do not put the hat in the dryer or spin. Dry cleaning allowed.