diff --git a/packages/documentation-site/patternfly-docs/content/foundations-and-styles/styles/colors/colors.md b/packages/documentation-site/patternfly-docs/content/foundations-and-styles/styles/colors/colors.md
index 6a77d020d9..bc46c99614 100644
--- a/packages/documentation-site/patternfly-docs/content/foundations-and-styles/styles/colors/colors.md
+++ b/packages/documentation-site/patternfly-docs/content/foundations-and-styles/styles/colors/colors.md
@@ -190,6 +190,8 @@ Status and state colors are indicators that communicate data and actions to user
To check the contrast between background and text colors, use a WCAG AA-compliance tool.
+Beyond our standard contrast ratio, we support a high contrast and a glass contrast mode, as documented in our [theming guidelines](http://localhost:8003/foundations-and-styles/theming#contrast-modes).
+
## Color families
Our color palettes are organized into "families" that contain different shades of the same hue. In the following families, you can expand each color to see related tokens.
diff --git a/packages/documentation-site/patternfly-docs/content/foundations-and-styles/styles/theming/glass-mode-handbook.md b/packages/documentation-site/patternfly-docs/content/foundations-and-styles/styles/theming/glass-mode-handbook.md
new file mode 100644
index 0000000000..bf92554f08
--- /dev/null
+++ b/packages/documentation-site/patternfly-docs/content/foundations-and-styles/styles/theming/glass-mode-handbook.md
@@ -0,0 +1,66 @@
+---
+id: Theming
+section: foundations-and-styles
+source: glass-mode-handbook
+---
+
+# Glass mode developer handbook
+
+## What is glass mode?
+
+Glass mode is a contrast mode option that's enabled in our Felt theme by default and can be manually enabled in our Default theme. Glass adds transparency, blurring, and depth to the UI to create a more dynamic visual effect where brand-approved background images and layered UI elements subtly show through.
+
+When turned on, glass applies to the following components, including their uses within our extensions:
+- Card
+- Drawer
+- Login page
+- Masthead
+- Navigation (docked)
+- Page
+- Panel
+
+### Background images
+
+The glass effect is most visible when placed over a background image. Background images should be selected or designed for each Red Hat product in collaboration with the Brand team. To retain readability and ensure proper contrast ratios are met, images shouldn't contain high levels of detail or extreme contrast.
+
+Text must never be placed directly on a background image—it should be placed within a container that has a background color or glass effect. Titles or headings with stronger font weights can be placed directly on background images only if they pass specific brand and contrast requirements.
+
+### Opacity
+
+The default opacity values used in our components have been tested for accessibility, legibility, and visual appeal.
+- Felt light typically utilizes a 40% opacity to maintain AAA contrast for standard text.
+- Felt dark utilizes a 60% opacity to provide better reliability for the dark color scheme.
+
+If a product team chooses to override these token values, they are responsible for conducting their own accessibility evaluation to ensure WCAG compliance.
+
+## Enabling glass mode
+
+Glass mode is designed to work across light and dark color schemes and is enabled by default in our Felt theme. To manually enable glass in our Default theme, add the class `.pf-v6-theme-glass` to your application’s `` tag. When implementing glass with our Default theme, it's important to ensure that glass does not harm the overall accessibility or usability of your product.
+
+### Technical constraints
+
+There are a few technical constraints to abide by when using glass in your product.
+
+- **No glass-on-glass layering:** Never layer glass-enabled containers. Doing so can cause significant performance and accessibility problems. For example, child objects inside a blurred parent container can become illegibly blurred themselves. To mitigate this, we have intentionally adjusted the opacity of our background color design tokens to simulate depth without introducing extra blur.
+- **High contrast precedence:** If high-contrast mode is enabled, all glass effects must be automatically disabled to prioritize functional accessibility.
+- **User controls and preferences:** Because glass mode introduces legibility risks, any product utilizing glass must also let users swap between default contrast and high contrast modes via a theme switcher or preferences menu. Products should also respect the OS-level `prefers-reduced-transparency` media query, disabling glass or replacing it with a solid high-opacity background to accommodate users appropriately.
+
+## Glass design tokens
+
+The following tokens are used together to create the glass effect.
+
+| Token | Value (in Felt theme) | Usage |
+| --- | --- | --- |
+| `-pf-t--global--background--color--glass--primary--default` | Light mode value: #FFFFFF (60% opacity)
Dark mode value: #292929 at 50% opacity | Base fill for glass containers. |
+| `-pf-t--global--background--filter--glass--default` | Light mode value: #C7C7C7 (25% opacity)
Dark mode value: #C7C7C7 (15% opacity) | Overlay tint used to enhance blur visibility. |
+| `-pf-t--global--border--color--glass--default` | Light mode value: #FFFFFF (60% opacity)
Dark mode value: #292929 (50% opacity) | Boundary highlight for glass surfaces. |
+| `-pf-t--global--border--radius--glass--default` | #D6D6D6 with 16px radius | Default rounded border for glass element. |
+| `-pf-t--global--background--color--sticky--default` | Light mode value: #FFFFFF (100% opacity)
Dark mode value: #292929 (100% opacity) | Solid background for sticky elements, like headers. |
+| `-pf-t--global--box-shadow--medium` | #292929 (15% opacity) | Shadow that signifies elevation. |
+
+## Best practices
+
+To ensure a successful implementation, follow these best practices:
+- Ensure all text meets a 4.5:1 (AA) contrast ratio.
+- Ensure that high contrast mode overrides any use of glass to maintain accessibility requirements.
+- Always verify glass components against both light and dark background variations to catch contrast failures early.
\ No newline at end of file
diff --git a/packages/documentation-site/patternfly-docs/content/foundations-and-styles/styles/theming/theming.md b/packages/documentation-site/patternfly-docs/content/foundations-and-styles/styles/theming/theming.md
index 8baa660e31..791939817a 100644
--- a/packages/documentation-site/patternfly-docs/content/foundations-and-styles/styles/theming/theming.md
+++ b/packages/documentation-site/patternfly-docs/content/foundations-and-styles/styles/theming/theming.md
@@ -8,17 +8,44 @@ import '../../../components/components.css'
import { Alert, AlertActionLink} from '@patternfly/react-core';
import ExternalLinkAltIcon from '@patternfly/react-icons/dist/esm/icons/external-link-alt-icon';
-A **theme** applies a specific visual style to all UI components in order to create a unique, cohesive, and purposeful look. The use of theming can provide more flexibility for user preferences, as well as different options for accessibility needs.
+A **theme** applies specific visual styles to UI components to create a unique, cohesive, and purposeful look. Our theming architecture leverages [our design token system](/foundations-and-styles/design-tokens/overview) to flexibly support different brand identities, user preferences, and accessibility needs.
-Theming is supported in PatternFly through [our design token system](/foundations-and-styles/design-tokens/overview), which was intentionally structured so that sets of tokens can be adjusted together to create alternate UI styles. By reassigning token values, the fonts, spacing, shadows, and borders in a UI can be changed together to create a theme. This system has enabled us to create multiple PatternFly themes, while also supporting the ability for you to create custom themes.
+## Theming architecture
-## PatternFly themes
+We utilize a tiered theming architecture to consistently manage the appearance of UIs:
+- **Theme:** Defines the foundational brand appearance, including core colors, border radii, iconography, and assets.
+- **Color scheme:** Controls the brightness and palette shifts between light and dark environments.
+- **Contrast mode:** Adjusts the style of surfaces and elements for specific aesthetic or accessibility needs.
-The following themes are currently supported across PatternFly components and are designed to meet specific [WCAG accessibility standards](https://www.w3.org/WAI/standards-guidelines/wcag/). You can explore our different themes on our website by toggling your display preferences in our site's masthead dropdown.
+## Themes
+
+We support 2 pre-built themes in PatternFly. While the visual identity of each theme differs, they share the same underlying interaction patterns and accessibility standards.
+
+### Default theme
+
+The Default theme creates the standard, open source PatternFly experience. It is characterized by blue branding, modern, square borders, and simple icons.
+
+### Felt theme
+
+The Felt theme is designed for products within the Red Hat portfolio, providing closer alignment with the [Red Hat Design System](https://ux.redhat.com/). It is characterized by red accent colors, smooth, rounded borderds, Red Hat icons, and [glass contrast mode](#glass). Core interactive elements, such as primary buttons, continue to use blue for usability.
+
+### Custom themes
+
+To branch off of our themes and create your own, you can identify the design tokens you'd like to adjust on our [all tokens page](/foundations-and-styles/design-tokens/all-design-tokens) and provide new values to use within your application.
+
+#### When to customize a theme
+
+There are a couple of instances when you might want to adjust an existing PatternFly theme:
+- One-off adjustments, like changing a single button color, spacer, or font size, when intentional deviation is needed across your product.
+- Application-wide adjustments, like changing all button colors and font sizes to adjust the overall brand identity of your product.
+
+## Color schemes
### Light mode
-Generally, light mode is the default appearance of PatternFly. In this mode, dark text is presented on light backgrounds to meet a [text contrast ratio of at least 4.5:1](https://www.w3.org/WAI/WCAG22/quickref/?versions=2.1#contrast-minimum), while colors for other UI elements meet a [non-text contrast ratio of at least 3:1](https://www.w3.org/WAI/WCAG22/quickref/?versions=2.1#non-text-contrast). Some users might find it easier to read text on light screens, while others might simply prefer the appearance.
+Light mode is the standard appearance for most web environments.
+
+Light mode places dark text on light backgrounds, while maintaining a [text contrast ratio of at least 4.5:1](https://www.w3.org/WAI/WCAG22/quickref/?versions=2.1#contrast-minimum) and a [non-text contrast ratio of at least 3:1](https://www.w3.org/WAI/WCAG22/quickref/?versions=2.1#non-text-contrast). Some users might find light screens easier to read, while others might simply prefer the appearance.
High contrast mode is still under development and will continue to evolve and be enabled for charts and extensions. This beta allows you to preview our progress.
-