The Trooper is a comfortable mummy sleeping bag that will ensure you get a good night s sleep on exercise. It is filled with 250gsm hollowfibre, a lightweight synthetic insulation that retains its warmth even if it gets wet and dries out quickly, ideal if you're on a multi-day operation. Its tough shell is lined with a cotton-feel polyester, which is soft against your skin and compressible, so it can be stuffed and carried in a small sack.