The North Face Mercurial Sleeping Bag

Introducing the most innovative sleeping bag since time began (probably) - The North Face Mercurial Liner Bag.Featuring a reversible design for one to wear for maximum warmth, or to keep the body cool. Below is The North Face's detailled and concise description.

"The reversible Mercurial Liner Bag features innovative new baffle technology and a unique insulation distribution that enables temperature regulation through the retention or release of heat.
In cold weather, when the bag is used with the black fabric side out, small pockets created by the internally exposed baffles catch and retain warm air.
In warmer weather, the bag can be reversed for a cooling effect. With the light grey side out, the innovative baffle system permits the baffles to flex open, allowing air to circulate between the panels. The cool air flows close to the body to channel away excess heat, keeping the wearer much cooler than when the black side is out. Furthermore, the bottom of the Mercurial Liner Bag is constructed from a layer of super-soft brushed polyester and contains no insulation whatsoever. Wearing the bag with this side on top and the insulation underneath provides yet another insulation alternative for use in weather too warm for either of the insulated options.
Able to provide multiple insulation options, The North Face® Mercurial Liner Bag is an infinitely adaptable, lightweight travel bag for those who want to be prepared for anything."