All hunters know how quickly a stalk can go horribly wrong if the wind changes direction part way through an approach, so successful stalkers use skill, and appropriate kit to maximise their performance. It is well known that Deer rely on their 3 senses to survive, and that some species have better eyesight than others, but what is common to all is that their primary defence is scent. The consensus from leading stalkers and pro hunters is that on average Deer rely on 65% Scent 15% Eyesight, 20% Hearing Over the years many attempts have been made to overcome this, deodorant sprays, pine flavoured chewing gum, scent treated garments etc. BUT the basic fact remains, a Hunter exhales 10,000 litres of HUMAN scent every day, & no amount of kit and skill will produce results if a deer catches your scent. Its game over and often you never even saw them! Some folks check wind occasionally, especially at the beginning of a stalk, with powders, cigarettes, or just observing the trees. Rarely is the ground level air moving in the same way as the tree tops, and it can change instantly as you walk, affected by hedges, terrain & turbulence, sufficient to wreck an approach. It is therefore important to check and re check often. Airglo was developed by Napier to be easy and convenient to use. First we looked at the alternatives and found that most use quite large particles & just pack in squat bottles, very difficult to grip and never easy to find in the pocket just when required. Pack Contains:1 Dispenser & 1 camo neoprene sleeve with belt clip and neck cord.