Instruct: Classify a given Amazon review as either positive or negative.
Query: "Lukewarm Hands": a frustrating disappointment

I have severe Raynaud's syndrome in most of my fingers so I'm always looking for new disposable hand warmers. I had high hopes for these because of the positive reviews, but, unfortunately, they are the worst I've ever tried. To date, I've used 6 of them (in the "20-pak" I bought), and all six were very disappointing. After 40 minutes, they got mildly lukewarm and then they cooled down totally after 3 hours. They're worthless. I don't expect hand warmers to get so hot that they burn my skin, but I do expect them to radiate enough heat to warm up my frozen fingers. And they don't. (As an afterthought, I reread the most positive reviews to see why they had convinced me to buy this product and I realized that they are so inaccurate and sound so much like advertising copy that they were probably written by a company shill). I urge you to save your money and buy another product that works.