Insulated cowl covers

Looking for pirep on insulated cowl covers. I?ve looked into Bruce?s and Aerocovers in Canada. Any first hand experience with either company and your thoughts on the product is greatly appreciated. Thanks Joe

I hate to sound cheap, but, I picked up a packing blanket at Harbor Freight and threw it over the cowl. A simple pinch clamp to hold it closed. I then put a heater on low under the blanket and it stays nice and warm.