diff --git a/markup/spreadsheet.py b/markup/spreadsheet.py
index 69c382c..09d0ed1 100644
--- a/markup/spreadsheet.py
+++ b/markup/spreadsheet.py
@@ -35,7 +35,7 @@ def write_spreadsheet(matches, workdir, file_base):
     ws = wb.active
 
     # header row
-    ws.append(['Style Number', 'Product Name', 'Season', 'Color', 'Category', 'Size Range'])
+    ws.append(['style number', 'product name', 'season', 'color', 'category', 'size range'])
 
     # style the header row
     ws.column_dimensions['A'].width = 15
@@ -57,13 +57,13 @@ def write_spreadsheet(matches, workdir, file_base):
     for m in matches:
         # in the case of kids,
         # we might have multiple products in a match
-        seasons    = m['season'].split('\n')
-        genders    = m['gender'].split('\n')
-        names      = m['name'].split('\n')
-        materials  = m['material'].split('\n')
-        colors     = m['color'].split('\n')
-        sizes      = m['size'].split('\n')
-        categories = m['category'].split('\n')
+        seasons    = m['season'].lower().split('\n')
+        genders    = m['gender'].lower().split('\n')
+        names      = m['name'].lower().split('\n')
+        materials  = m['material'].lower().split('\n')
+        colors     = m['color'].lower().split('\n')
+        sizes      = m['size'].lower().split('\n')
+        categories = m['category'].lower().split('\n')
 
         for s, g, n, m, c, sz, ct in zip_longest(seasons, genders, names, materials, colors, sizes, categories, fillvalue=''):
             if not m in seen: