The wool is so light and thin - perfect for not only looking good but keeps the right amount of heat in and moisture wicking away. The thinness is great for working with hard hats or helmet or other head gear and I really appreciate this. My son in law saw mine, studied it and immediately pulled up the point6 website to order one for his work - he hadn’t been able to find something thin enough to keep him warm but thin enough to fit under his hard hat. Great beanie.