The Surge Hand Warmer is a modular accessory that is easily added to any Surge Predator Pack, Surge Pistol Pack, or Thermal Pistol Pack. At the bottom of these packs, there is a female buckle receptacle that the hand warmer snaps into. Each hand warmer comes with a fully adjustable waist belt. The Surge Hand Warmers are lined with soft fleece and filled with insulation to help keep your hands warm and comfortable during the cold temps of calling season. &l