This Voksi City North baby sleeping bag combines high-quality down filling (80% down, 20% feather) with a 100% wool back layer to regulate temperature and help keep a baby dry. This model uses a unique box construction that traps air between down fibers for maximum insulation in autumn and winter, while a soft 100% cotton inner fabric creates a comfortable sleeping surface. This sleeping bag features a windproof 100% nylon outer fabric with BIONIC-FINISH®ECO water repellency and a minimum 8000 mm water column for reliable waterproof performance; for heavy rain, an additional rain cover is recommended. This design fits a 5-point harness and is compatible with all strollers; always allow plenty of air around the head and use under supervision.