Tension Weights is a Geometry Nodes setup that calculates mesh compression and stretch resulting from deformations. The system requires placing one node group before deformation modifiers, such as armatures, and a second node group afterward. The resulting data can be output as vertex colors or vertex groups to drive material effects such as dynamic wrinkles or normal mapping. The setup includes support for a base reference object required for shapekey calculations and utilizes a vertex color mask to restrict wrinkles in convex areas.