With its waterproof breathable outer eraloft insulation and thermacapture insulation this compact and lightweight therm a rest proton blanket is ideal for summer backpacking and snuggling around the campfire in therm a rest s blanket range offers a fantastic level of versatility a reliable level of warmth and comfort for a broad range of conditions and this blanket has been designed for their fast and light customers with a pack size of only 37x13cm and weighing in at just over 500g this blanket