Our custom printed single-use Hand Warmer 2-Pack (printing on outer packaging only) is an ideal promo giveaway for a variety of occasions! Air activated portable heat. Stays warm for up to 10 hours. Each package contains two hand warmers. Slip warmers into gloves, pockets, or between layers for best results. Do not use while sleeping. One color/one location imprint only. Not eligible to be shipped to Canada.