Smartwool Quilted Bells Hat - Women's Merino Wool Imported Textured multicolored knit Interior headband liner Shell: 50% Merino Wool/ 50% Acrylic Headband Liner: 100% Merino Wool Merino wool fibers' smaller diameter prevents the itching associated with normal wool Merino wool is soft, comfortable, durable, breathable and renewable Merino wool's breathability wicks away moisture for natural climate control Merino wool is also odor-resistant, machine washable and quick-drying One size fits most