Lightweight, super compact. Adds up to 10 degrees of warmth * Premium AA Grade, ripstop silk. Polyester/Lycra stretch gussets improve comfort and life of liner * Machine washable & colorfast. Packaged in its own stuff sack * Double folded and reinforced seams. Traveler model has built in pillow case and is Hostel Approved * Standard - 4.6oz; Traveler - 6oz; Mummy - 4.8oz; Long - 5oz; Double 9oz