QEZER Down Sleeping Bag,Lightweight Rectangular Winter Sleeping Bag [1180g/1860g] for Adults and Kids 4 Season Camping, Hiking,Warehouse and Moutaineering OutdoorPremium Down: The rectangular sleeping bag is filled 500g RDS certified duck down,with a fluffiness of 620FP. Purely natural, healthy, environmentally friendly, skin friendly, odorless and free of impurities, lighter and warmer, with excellent thermal insulation performance Super Warm: This down sleeping bag is filled with four different weights to meet the needs of outdoor enthusiasts in different seasons. The comfortable temperature is 5C to 15C,