Cumulus
Cumulus Polish Down products exclusively use down from the highly-regarded Polish goose, which is considered the best in the world in terms of the fill power. Premium down feathers are the most important component of any down feather products, because it determines the efficiency of the insulation and provides reliable comfort even in the most hostile conditions.
Down is twice as efficient insulator than even the best synthetic insulation and Cumulus Polish Down products are the warmest and lightest gear designed for backpacking and camping in mind. Their products loses their loft extremely slowly and with average intensive usage and proper maintenance their down sleeping bags and down jackets and outerwear can reliably last for 20-30 years.