The Echo 400 is a 4-season mummy sleeping bag designed for pure Baltic nights in the depths of winter. Its mummy shape and thick shoulder section keep body heat inside. The technical synthetic filling provides loft and warmth without adding weight. Designed for adventures in the cold Scottish mountains, our Echo 400 is an extremely warm, technical sleeping bag with a host of features to protect you from the elements. The double layer construction and thick spiral insulation provide excellent cold weather performance, while the adjustable hood and draft collar ensure the warmth stays in the sleeping bag so you can sleep well in the harshest environments.