Testing electric blankets means using them properly. First, we explain how easy they are to fit and how easy they are to remove, as these are devices that should only be put on when they're used and removed during the summer months. This also lets us test coverage: how much of the mattress the heated blanket actually goes over. Comfort is exceptionally important, which is why we sleep on our review blankets. Poor-quality ones can affect the feel of a mattress, and the controls can prove to be uncomfortable to sleep on. Next, we test how well the electric blankets work. We test them on all of their settings and let you know if there are any cold spots. Some blankets, we've found, will heat up perfectly in the middle, but can have colder spots towards the edges. Others make the pillow area too warm, while some don't heat all the way to the bottom. Finally, we give you running costs based on the maximum power and the current electricity rate of 34p per kWh.