Some 25 years ago, Thinsulate insulation was introduced as the original "warmth without bulk" insulation (click here for detailed information). And it virtually revolutionized the insulation industry overnight.  In fact, when equal thicknesses are compared, it provides about 1-1/2 times the warmth of down and about twice the warmth of other high-loft insulation materials. And because Thinsulate insulation absorbs less than 1% of its weight in water, it retains its insulating ability even in damp conditions. The unique microfibers of Thinsulate insulation are about ten times smaller than the fibers of other synthetic insulations, which means theyre much more efficient at trapping air. . . and more effective at keeping you warm and comfortable. It also means more fibers can be packed into the same space, where they can reflect back more of the body's radiant heat.  
Care Instructions: Thinsulate is machine washable and dry cleanable once you have secured it inside the project. Do not clean it until it is sewn inbetween two layers of fabric.