For%20skiers%2C%20hunters%2C%20fishermen%2C%20golfers%2C%20campers%20or%20anyone%20who%20works%20or%20plays%20in%20the%20cold.%20portable%20heat%20source%20that%20operates%20at%20an%20average%20temperature%20of%20135%20deg%20f%20that%20last%20for%20seven%20hours%20or%20more.%20easily%20fits%20in%20gloves%20and%20pockets.%20air%20activated.