diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6bfc474..9de7fcd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -20,6 +20,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - Changed to consolidate vector-related functions into one place.
 - Changed stack handling from List to a fixed-size array with manual index management for optimization in `RcLayers.BuildHeightfieldLayers()`
 - Changed to use Span<byte> and stackalloc for improved performance and memory management in `RcLayers.BuildHeightfieldLayers()`
+- Changed vertCount and triCount to byte in `DtPolyDetail`
 
 ### Removed
 - Removed RcMeshDetails.VdistSq2(float[], float[])
diff --git a/src/DotRecast.Detour.Extras/Unity/Astar/GraphMeshDataReader.cs b/src/DotRecast.Detour.Extras/Unity/Astar/GraphMeshDataReader.cs
index 74c7f7f..db7124d 100644
--- a/src/DotRecast.Detour.Extras/Unity/Astar/GraphMeshDataReader.cs
+++ b/src/DotRecast.Detour.Extras/Unity/Astar/GraphMeshDataReader.cs
@@ -101,9 +101,9 @@ namespace DotRecast.Detour.Extras.Unity.Astar
                         ymax = Math.Max(ymax, verts[nodes[i].verts[1] * 3 + 1]);
                         ymax = Math.Max(ymax, verts[nodes[i].verts[2] * 3 + 1]);
                         int vertBase = 0;
-                        int vertCount = 0;
+                        byte vertCount = 0;
                         int triBase = i;
-                        int triCount = 1;
+                        byte triCount = 1;
                         detailNodes[i] = new DtPolyDetail(vertBase, triBase, vertCount, triCount);
                         detailTris[4 * i] = 0;
                         detailTris[4 * i + 1] = 1;
diff --git a/src/DotRecast.Detour/DtNavMeshBuilder.cs b/src/DotRecast.Detour/DtNavMeshBuilder.cs
index bb9a276..632d89a 100644
--- a/src/DotRecast.Detour/DtNavMeshBuilder.cs
+++ b/src/DotRecast.Detour/DtNavMeshBuilder.cs
@@ -556,9 +556,9 @@ namespace DotRecast.Detour
                     int ndv = option.detailMeshes[i * 4 + 1];
                     int nv = navPolys[i].vertCount;
                     int vertBase = vbase;
-                    int vertCount = (ndv - nv);
+                    byte vertCount = (byte)(ndv - nv);
                     int triBase = option.detailMeshes[i * 4 + 2];
-                    int triCount = option.detailMeshes[i * 4 + 3];
+                    byte triCount = (byte)option.detailMeshes[i * 4 + 3];
                     navDMeshes[i] = new DtPolyDetail(vertBase, triBase, vertCount, triCount);
                     // Copy vertices except the first 'nv' verts which are equal to
                     // nav poly verts.
@@ -580,9 +580,9 @@ namespace DotRecast.Detour
                 {
                     int nv = navPolys[i].vertCount;
                     int vertBase = 0;
-                    int vertCount = 0;
+                    byte vertCount = 0;
                     int triBase = tbase;
-                    int triCount = (nv - 2);
+                    byte triCount = (byte)(nv - 2);
                     navDMeshes[i] = new DtPolyDetail(vertBase, triBase, vertCount, triCount);
                     // Triangulate polygon (local indices).
                     for (int j = 2; j < nv; ++j)
diff --git a/src/DotRecast.Detour/DtPolyDetail.cs b/src/DotRecast.Detour/DtPolyDetail.cs
index 53fabec..5bc02f9 100644
--- a/src/DotRecast.Detour/DtPolyDetail.cs
+++ b/src/DotRecast.Detour/DtPolyDetail.cs
@@ -25,10 +25,10 @@ namespace DotRecast.Detour
     {
         public readonly int vertBase; //< The offset of the vertices in the dtMeshTile::detailVerts array.
         public readonly int triBase; //< The offset of the triangles in the dtMeshTile::detailTris array.
-        public readonly int vertCount; //< The number of vertices in the sub-mesh.
-        public readonly int triCount; //< The number of triangles in the sub-mesh.
+        public readonly byte vertCount; //< The number of vertices in the sub-mesh.
+        public readonly byte triCount; //< The number of triangles in the sub-mesh.
 
-        public DtPolyDetail(int vertBase, int triBase, int vertCount, int triCount)
+        public DtPolyDetail(int vertBase, int triBase, byte vertCount, byte triCount)
         {
             this.vertBase = vertBase;
             this.triBase = triBase;
diff --git a/src/DotRecast.Detour/Io/DtMeshDataReader.cs b/src/DotRecast.Detour/Io/DtMeshDataReader.cs
index a258c5d..7c837ed 100644
--- a/src/DotRecast.Detour/Io/DtMeshDataReader.cs
+++ b/src/DotRecast.Detour/Io/DtMeshDataReader.cs
@@ -173,8 +173,8 @@ namespace DotRecast.Detour.Io
             {
                 int vertBase = buf.GetInt();
                 int triBase = buf.GetInt();
-                int vertCount = buf.Get() & 0xFF;
-                int triCount = buf.Get() & 0xFF;
+                byte vertCount = (byte)(buf.Get() & 0xFF);
+                byte triCount = (byte)(buf.Get() & 0xFF);
                 polys[i] = new DtPolyDetail(vertBase, triBase, vertCount, triCount);
                 if (cCompatibility)
                 {