Alpaca wool is simply the warmest all-weather friendly fiber. It contains microscopic air pockets, that provide great insulation and keep birds warm. The fibers are fine, lightweight and silky, yet this luxury fiber has great strength and durability. Another reason why Alpaca wool is so versatile is because of its weight, or lack thereof. It is almost as light as air. Packaged in 3 OZ ready-to-hang mesh bags. Chickadees, Titmouse and other songbirds love and use it. Microscopic air pockets help provide great insulation. Warmest all-weather friendly fiber. Lightweight, yet strong and durable. Repels water and quickly dries.