Kelty Light Year XP 20-Degree Climashield XP Sleeping Bag 20 F/-7 C Mummy Insulation: Climashield CP. Shell: NPR241T nylon-polyester diamond cross-dye ripstop. Liner: P300T polyester microfiber pongee Two-layer, offset-quilt construction and efficient from-fitting hood. Top baffle collar and insulated hood baffle External snal loops allow bag to function as a liner