diff --git a/Mu2eG4/geom/TransportSolenoid_v08.txt b/Mu2eG4/geom/TransportSolenoid_v08.txt
index 116dd50974..b5220526d6 100644
--- a/Mu2eG4/geom/TransportSolenoid_v08.txt
+++ b/Mu2eG4/geom/TransportSolenoid_v08.txt
@@ -17,6 +17,9 @@ int            pbarwedge.nStrips          = 2;
 vector<double> pbarwedge.stripThicknesses = { 0.127, 0.127 };  // mm
 vector<double> pbarwedge.stripHeights     = {  90.0, 140.0 };  // mm
 
+// Switch the COL5 material name, but the underlying material is G4_POLYETHYLENE
+string ts.coll5.material1Name = "COL5Poly";
+
 // This tells emacs to view this file in c++ mode.
 // Local Variables:
 // mode:c++
diff --git a/Mu2eG4/src/ConstructMaterials.cc b/Mu2eG4/src/ConstructMaterials.cc
index 331615bbd1..55aeea3145 100644
--- a/Mu2eG4/src/ConstructMaterials.cc
+++ b/Mu2eG4/src/ConstructMaterials.cc
@@ -1832,6 +1832,14 @@ namespace mu2e {
      Ti6Al4V->AddMaterial(findMaterialOrThrow("G4_V"),VPercentage*CLHEP::perCent);
     }
 
+    // COL5 poly
+    mat = uniqueMaterialOrThrow("COL5Poly");
+    {
+      G4Material* met = findMaterialOrThrow("G4_POLYETHYLENE");
+      G4Material* poly = new G4Material(mat.name, met->GetDensity(), 1);
+      poly->AddMaterial(met, 1.);
+    }
+
     // Add new materials before this line
 
   }