The Porter beanie is crafted from 100% Merino and designed around a traditional ribbed fisherman beanie, this is a wardrobe staple for the colder months. In addition, you can feel proud knowing that you are wearing an accessory made from 100% natural fibers that are durable, sustainable and temperature regulating. Wool is somewhat of a miracle fabric as it is highly sustainable, renewable, biodegradable, recyclable and flame-resistant. We believe it is the most sustainable fabric out there so that is why Peregrine make sure all of their jumpers are always 100% wool. Wool biodegrades in a few months, while Nylon can take many years. Merino Wool: Some of the key benefits of Merino wool is that it is breathable, antibacterial, soft and warm.