When you want to throw something on and know youre going to be warm all day long, this is it. Thanks to Pertex Quantum fabric, its durable against the elements and the lightweight fabric makes it ideal for layering up. Synthetic Hydroloft Polyball insulation is the secret behind this vests warmth. Its breathable too so you will stay fresh on the go. Did we mention its compact for packing away and its zipped pockets will keep your essentials safe? A unique and durable wardrobe staple which always offers superior warmth.