Part # THE-15001 from Summit Racing.
Basically you make some measurements of the turbine dimensions, and then cut out the blanket and wrap. Then you stitch up the blanket with some metal wire, and tie it to the turbo. On the exhaust side you use header wrap material underneath the blanket material. On the intake side, use just the blanket. Took about an hour total to cut, stitch, and install. The kit comes with a lot of extra blanket, so you can insulate other things with it, like hoses and engine components.