Nanga Udd Bag 380DX Long Sleeping Bag - CharcoalNanga built their reputation on developing sleeping bags designed to perform in some of the most extreme climates on Earth. The Udd Bag is a high performing sleeping bag which can perform well even in wet conditions. A three season model, it is constructed from a ripstop nylon with a water repellent finish and in addition has a high performance 770FP duck down which has a waterproofing treatment aiding its function and performance in damp conditions.