Here is a description on trailspace.com
"To provide our customers with the best sleeping bags possible Western Mountaineering sleeping bags are hand made to order in San Jose, California. Order one today and it will ship in two weeks. It is worth the wait!When you need to extend the range of your sleeping bag system, play it safe and carry our 14 ounce LineLite liner. This mummy-cut, box stitched, sewn-thru liner has no foot box or hood to compete with the available space inside your sleeping bag. This design prevents excessive down compression. Both the top and bottom sections are open and use a bungie cord to snug up. The top is cut with side slits so that you can pull your arms out. And since the foot section is open, the velcro closures at the top act as suspenders so you can wear the LineLite and walk about camp. When you're ready to retire use the bungie cord at the foot to close up the bottom. The LineLite would add 10 Degrees or more depending upon the bag it is going into. Available in a 6'3in. length only. Sewn-Thru Box Construction 2 1/2in. Loft, 45 Degrees F 60in./38in. Shoulder/Foot Girth 7 oz. Down Fill Bungie Neck Closure 14 oz. Total Weight Adds about 15 Degrees F as a liner. Specs: Shape: Mummy Size: 6'3” Rating: 45 deg F Loft: 2.5” Inside Girth shoulder / hip / foot: 60”/52”/38” Fill Wt.: 7 oz Total Wt.: 14 oz Stuff Size: 6 x 10"