diff -r e7920e205785 -r bea0c3841ced src/direct_product.rs
--- a/src/direct_product.rs	Tue Sep 02 15:18:30 2025 -0500
+++ b/src/direct_product.rs	Wed Sep 03 09:16:03 2025 -0500
@@ -275,10 +275,18 @@
         Pair(self.0.into_owned(), self.1.into_owned())
     }
 
-    /// Returns an owned instance of a reference.
+    #[inline]
     fn clone_owned(&self) -> Self::OwnedVariant {
         Pair(self.0.clone_owned(), self.1.clone_owned())
     }
+
+    #[inline]
+    fn cow_owned<'b>(self) -> MyCow<'b, Self::OwnedVariant>
+    where
+        Self: 'b,
+    {
+        MyCow::Owned(self.into_owned())
+    }
 }
 
 /// We only support 'closed' `Euclidean` `Pair`s, as more general ones cause
@@ -392,8 +400,6 @@
     D: Decomposition<A>,
     Q: Decomposition<B>,
 {
-    type OwnedInstance = Pair<D::OwnedInstance, Q::OwnedInstance>;
-
     type Decomposition<'b>
         = Pair<D::Decomposition<'b>, Q::Decomposition<'b>>
     where
@@ -443,7 +449,7 @@
     }
 
     #[inline]
-    fn cow<'b>(self) -> MyCow<'b, Pair<D::OwnedInstance, Q::OwnedInstance>>
+    fn cow<'b>(self) -> MyCow<'b, Pair<A::OwnedSpace, B::OwnedSpace>>
     where
         Self: 'b,
     {
@@ -451,7 +457,7 @@
     }
 
     #[inline]
-    fn own(self) -> Pair<D::OwnedInstance, Q::OwnedInstance> {
+    fn own(self) -> Pair<A::OwnedSpace, B::OwnedSpace> {
         Pair(self.0.own(), self.1.own())
     }
 }
@@ -494,7 +500,7 @@
     }
 
     #[inline]
-    fn cow<'b>(self) -> MyCow<'b, Pair<D::OwnedInstance, Q::OwnedInstance>>
+    fn cow<'b>(self) -> MyCow<'b, Pair<A::OwnedSpace, B::OwnedSpace>>
     where
         Self: 'b,
     {
@@ -502,7 +508,7 @@
     }
 
     #[inline]
-    fn own(self) -> Pair<D::OwnedInstance, Q::OwnedInstance> {
+    fn own(self) -> Pair<A::OwnedSpace, B::OwnedSpace> {
         let Pair(ref u, ref v) = self;
         Pair(u.own(), v.own())
     }