Zinger Deluxe 3500 Airline Approved Kennel Charger breathable technology• Reinforced shooting shoulders breathable technology• Reinforced shooting shoulders for stability and reduced wear• Full mobility design for smooth gun mount and swing• Multiple cargo and shell pockets for quick access to gear• Quiet If you are looking for a training collar that is great around the house as well as in the field The DX3500 2 AR comes with 3 rows of ventilation holes along both the top and bottom of its non door and non barred sides Our open design allows air to pass freely thru the door aided by the rows of vent holes which surround the crate