diff --git a/packages/builder/src/components/ComponentOptions/components/Content/Loop/Grid/header.js b/packages/builder/src/components/ComponentOptions/components/Content/Loop/Grid/header.js
new file mode 100644
index 000000000..615bd786d
--- /dev/null
+++ b/packages/builder/src/components/ComponentOptions/components/Content/Loop/Grid/header.js
@@ -0,0 +1,91 @@
+import React, { useState } from 'react'
+
+import { InputGroupButtonDropdown, DropdownToggle, DropdownMenu, DropdownItem,
+  InputGroup } from 'reactstrap'
+import classnames from 'classnames'
+
+import Icon from '../../../../../Icon'
+import { FastField, useField } from 'formik'
+
+const CellTypeDropdown = ({ name, disabled=false }) => {
+  const [field, , helpers] = useField(name)
+  const [dropdownOpen, setDropdownOpen] = useState(false)
+
+  return (
+    <InputGroupButtonDropdown
+      addonType="append"
+      disabled={ disabled }
+      isOpen={ dropdownOpen }
+      toggle={ () => setDropdownOpen(!dropdownOpen) }
+    >
+      <DropdownToggle
+        caret={ !disabled }
+        disabled={ disabled }
+        outline color="secondary"
+        // Ensure that the right-hand side always has rounded corners
+        // (this didn't work if the button was disabled)
+        className="rounded-right"
+      >
+        <Icon
+          icon={{
+            string: 'font',
+            number: 'tachometer',
+            boolean: 'adjust'
+          }[field.value]}
+          fixedWidth
+        />
+      </DropdownToggle>
+      <DropdownMenu right>
+        <DropdownItem header>Data type</DropdownItem>
+        <DropdownItem
+          className={ classnames({
+            'dropdown-item-active': field.value === 'string'
+          }) }
+          onClick={ () => helpers.setValue('string') }
+        >
+          Text <span className="text-muted">(categorical)</span>
+        </DropdownItem>
+        <DropdownItem
+          className={ classnames({
+            'dropdown-item-active': field.value === 'number'
+          }) }
+          onClick={ () => helpers.setValue('number') }
+        >
+          Numerical <span className="text-muted">(continuous)</span>
+        </DropdownItem>
+        <DropdownItem
+          className={ classnames({
+            'dropdown-item-active': field.value === 'boolean'
+          }) }
+          onClick={ () => helpers.setValue('boolean') }
+        >
+          Boolean <span className="text-muted">(binary)</span>
+        </DropdownItem>
+      </DropdownMenu>
+    </InputGroupButtonDropdown>
+  )
+}
+
+export const HeaderCell = ({ index }) =>
+  <InputGroup>
+    <FastField
+      name={ `templateParameters.columns[${ index }].name` }
+      placeholder={ `parameter${ index }` }
+      className="form-control text-monospace font-weight-bolder"
+      style={{ height: '42px' }}
+    />
+    <CellTypeDropdown name={ `templateParameters.columns[${ index }].type` } />
+  </InputGroup>
+
+export default ({ name, columns }) =>
+  <thead>
+    <tr>
+      <th></th>
+      { Array(columns).fill(null).map((_, i) =>
+        <th key={ `${ name }-header-${ i }` }>
+          <HeaderCell index={ i } />
+        </th>
+      ) }
+      <th></th>
+    </tr>
+  </thead>
diff --git a/packages/builder/src/components/ComponentOptions/components/Content/Loop/Grid/index.js b/packages/builder/src/components/ComponentOptions/components/Content/Loop/Grid/index.js
index 0db634406..13f4df015 100644
--- a/packages/builder/src/components/ComponentOptions/components/Content/Loop/Grid/index.js
+++ b/packages/builder/src/components/ComponentOptions/components/Content/Loop/Grid/index.js
@@ -2,6 +2,7 @@ import React, { Fragment } from 'react'
 
 import { FastField, useFormikContext } from 'formik'
 
+import Header from './header'
 import { Table, DefaultRow } from '../../../../../Form/table'
 
 const Row = ({ index: rowIndex, name, data, arrayHelpers }) =>
@@ -28,6 +29,7 @@ export default () => {
     name="templateParameters.rows"
     row={ Row }
     columns={ templateParameters.columns.length }
+    header={ Header }
     className="border-top-0"
   />
 }