Exped's Lite 900 Sleeping Bag 700 Goose Down 4 Season is Exped's reliable 4 season bag for any adventure treks in cold regions or winter touring. Although their Lite series bag are trimmed for weight, they offer the necessary width for additional laying when it gets chilly.The Lite 900 Sleeping Bag 700 Goose Down 4 Season is part of Exped's Trekking series. The sleeping bags in the Trekking category are designed to withstand the rigors and go anywhere. Lightweight yet comfortable, the Lite Line sleeping bags are alpine classics for 3 to 4 season use. A draft collar maximizes warmth by trapping warm air and further insulating the neck.