Verified Buyer Reviewed by doctorsoandso from houston, tx on Wednesday, January 5, 2011
these work well, and for MANY hours. i keep them in my gloves while skiing. they are activated by air, and occasionally they get 'cold'-ish, but all you have to do is take your gloves off for a minute and they get air exposure and they warm RIGHT up again. last from like 8:30 in the morning till like 5/6pm.
- Was this a gift?: No
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