We have personally tested these and they do a great job at keeping your hands warm and comfortable in the cold weather.
Easy and quick to charge, so far they have worked without recharging for around 12 hours wear. They're waterproof, windproof, silky soft, non-slip and are made from cotton and leather.
They're easy to clean and the battery can be removed if you want to wash them (probably not in a washing machine).
They're not too bulky and the Extra Large size fitted a man's hand no problem (equivalent to a Large Glove size in the US we would suggest).
Available in Black and Red. Sizes M, L and XL (Suggestion: Order one size bigger than your normal glove size).