Perfect for indecisive hikers, the ThermoBall™ Eco Gilet provides insulating warmth over your core - where it's most effective - leaving your arms free to decide whether it's actually cool enough for a jacket. The synthetic insulation maintains its insulating power even when damp and the durable nylon face fabric has been treated with a water-repellent finish - pretty convenient for European treks. It's highly compressible, even packing into its own pocket. And on top of all that, both the fabric and the insulation are made entirely from recycled materials, meaning less waste ends up in landfill.