diff --git a/spine-csharp/src/Skin.cs b/spine-csharp/src/Skin.cs
index 7b4c57b15..e7f8d8c06 100644
--- a/spine-csharp/src/Skin.cs
+++ b/spine-csharp/src/Skin.cs
@@ -35,8 +35,8 @@ namespace Spine {
 	/// <summary>Stores attachments by slot index and attachment name.</summary>
 	public class Skin {
 		internal String name;
-		private Dictionary<KeyValuePair<int, String>, Attachment> attachments =
-			new Dictionary<KeyValuePair<int, String>, Attachment>(AttachmentComparer.Instance);
+		private Dictionary<AttachmentKeyTuple, Attachment> attachments =
+			new Dictionary<AttachmentKeyTuple, Attachment>(AttachmentKeyTupleComparer.Instance);
 
 		public String Name { get { return name; } }
 
@@ -47,26 +47,26 @@ namespace Spine {
 
 		public void AddAttachment (int slotIndex, String name, Attachment attachment) {
 			if (attachment == null) throw new ArgumentNullException("attachment cannot be null.");
-			attachments[new KeyValuePair<int, String>(slotIndex, name)] = attachment;
+			attachments[new AttachmentKeyTuple(slotIndex, name)] = attachment;
 		}
 
 		/// <returns>May be null.</returns>
 		public Attachment GetAttachment (int slotIndex, String name) {
 			Attachment attachment;
-			attachments.TryGetValue(new KeyValuePair<int, String>(slotIndex, name), out attachment);
+			attachments.TryGetValue(new AttachmentKeyTuple(slotIndex, name), out attachment);
 			return attachment;
 		}
 
 		public void FindNamesForSlot (int slotIndex, List<String> names) {
 			if (names == null) throw new ArgumentNullException("names cannot be null.");
-			foreach (KeyValuePair<int, String> key in attachments.Keys)
-				if (key.Key == slotIndex) names.Add(key.Value);
+			foreach (AttachmentKeyTuple key in attachments.Keys)
+				if (key.SlotIndex == slotIndex) names.Add(key.Name);
 		}
 
 		public void FindAttachmentsForSlot (int slotIndex, List<Attachment> attachments) {
 			if (attachments == null) throw new ArgumentNullException("attachments cannot be null.");
-			foreach (KeyValuePair<KeyValuePair<int, String>, Attachment> entry in this.attachments)
-				if (entry.Key.Key == slotIndex) attachments.Add(entry.Value);
+			foreach (KeyValuePair<AttachmentKeyTuple, Attachment> entry in this.attachments)
+				if (entry.Key.SlotIndex == slotIndex) attachments.Add(entry.Value);
 		}
 
 		override public String ToString () {
@@ -75,27 +75,39 @@ namespace Spine {
 
 		/// <summary>Attach all attachments from this skin if the corresponding attachment from the old skin is currently attached.</summary>
 		internal void AttachAll (Skeleton skeleton, Skin oldSkin) {
-			foreach (KeyValuePair<KeyValuePair<int, String>, Attachment> entry in oldSkin.attachments) {
-				int slotIndex = entry.Key.Key;
+			foreach (KeyValuePair<AttachmentKeyTuple, Attachment> entry in oldSkin.attachments) {
+				int slotIndex = entry.Key.SlotIndex;
 				Slot slot = skeleton.slots.Items[slotIndex];
 				if (slot.attachment == entry.Value) {
-					Attachment attachment = GetAttachment(slotIndex, entry.Key.Value);
+					Attachment attachment = GetAttachment(slotIndex, entry.Key.Name);
 					if (attachment != null) slot.Attachment = attachment;
 				}
 			}
 		}
 
 		// Avoids boxing in the dictionary.
-		private class AttachmentComparer : IEqualityComparer<KeyValuePair<int, String>> {
-			internal static readonly AttachmentComparer Instance = new AttachmentComparer();
+		private class AttachmentKeyTupleComparer : IEqualityComparer<AttachmentKeyTuple> {
+			internal static readonly AttachmentKeyTupleComparer Instance = new AttachmentKeyTupleComparer();
 
-			bool IEqualityComparer<KeyValuePair<int, string>>.Equals (KeyValuePair<int, string> o1, KeyValuePair<int, string> o2) {
-				return o1.Key == o2.Key && o1.Value == o2.Value;
+			bool IEqualityComparer<AttachmentKeyTuple>.Equals (AttachmentKeyTuple o1, AttachmentKeyTuple o2) {
+			    return o1.SlotIndex == o2.SlotIndex && o1.NameHashCode == o2.NameHashCode;
 			}
 
-			int IEqualityComparer<KeyValuePair<int, string>>.GetHashCode (KeyValuePair<int, string> o) {
-				return o.Key;
+			int IEqualityComparer<AttachmentKeyTuple>.GetHashCode (AttachmentKeyTuple o) {
+				return o.SlotIndex;
 			}
 		}
+
+        private class AttachmentKeyTuple {
+            public readonly int SlotIndex;
+            public readonly string Name;
+            public readonly int NameHashCode;
+
+            public AttachmentKeyTuple(int slotIndex, string name) {
+                SlotIndex = slotIndex;
+                Name = name;
+                NameHashCode = Name.GetHashCode();
+            }
+        }
 	}
 }