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# isWatertight

Indicates whether the mesh is “watertight”.

```
final var isWatertight: Bool { get }
```

## Discussion

A mesh is watertight if the faces form a fully-closed volume (without gaps).
A watertight mesh is required for bodies to be inflatable, and is also the reason
why [`volume`](/documentation/RealityKit/ClothMeshResource/volume) will only return a non-nil value for watertight meshes.

If you want your body to be inflatable (by setting [`inflationConstraint`](/documentation/RealityKit/ClothBodyComponent/inflationConstraint-swift.property)),
the body mesh needs to be watertight.

---

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