Kelty SB20 (20-Degree) 800-Fill DriDown Sleeping Bag - Long RH by Kelty Fabric/Nylon Part of the new Kelty TraiLogic collection, the SB 20 is a highly technical and lightweight bag that features 800 fill DriDown technology. The unique waterproof protection at the head and foot will protect you from condensation when the chill sets in. Box baffle construction and zipper draft tube will keep the warmth in. The thermal-comfort hoot fit and natural fit toe box will have you ready to snore in no time.