IATA approved. The ventilation slits provide the best possible air circulation. The metal grille door with a practical lock system can be opened quickly and closes securely. Rigid construction: heavy plastics, locking metal door, side bars and very durable surface. Perfect for transport in the car, train, boat, plane or it can be used as a reliable mobile home.Sizes:Extra small - L50.5cm x W: 33.5cm x H: 33.5cmSmall - L60.5cm x W40cm x H40.5cmMedium - L66.5cm x W51cm x H47cmLarge - L81cm x W56cm x H59cmExtra Large - L90cm x W60cm x H68cmExtra Extra Large - L100cm x W67cm x H75cmExtra Extra Extra Large - L121cm x W82cm x H90cm