# isValid

> Check if the AABB is valid. To be valid, PhysicsAABB.upperBound should be equal to or above PhysicsAABB.lowerBound.

## Definition

* **Type:** Property
* **Namespace:** [Unity.U2D.Physics](/engine/7000.0/script-reference/unity/u2d/physics.md)
* **Assembly:** UnityEngine.PhysicsCore2DModule

```csharp
public readonly bool isValid { get; }
```