> ## Documentation Index > Fetch the complete documentation index at: https://docs.kleep.ai/llms.txt > Use this file to discover all available pages before exploring further. # Features > Size recommendations, add to cart, dynamic button labels, and tracking ## Find My Perfect Size The Kleep button visibility on the PDP is managed automatically during cartridge initialization: 1. **Enable** `isKleepRecommendationEnabled` — this is the master switch. 2. The cartridge dynamically shows/hides the button via middleware on the `Product-Show` controller action. 3. An endpoint call to Kleep with the `ProductID` determines whether the button appears. 4. Customize visibility conditions in your code to match your business rules. image.png Clicking the CTA opens an iframe using: ProductID, KleepCustomerID, the retailer identifier (the `kleepRetailerUUID` site preference, passed as the `domain` parameter), and language. ## Recommended Size → Add to Cart After the sizing flow, the user receives a recommendation. Clicking "Add to cart" sends an event from the iFrame and the selected size is added to cart. ## Dynamic Button Label After closing the popin, the button label updates: * **Before:** "Find My Perfect Size" * **After:** "Recommended Size: S" image.png The label persists via localStorage (no cookies or backend session variables). ## Tracking Analytics data is sent to Kleep automatically when: * A product is viewed (PDP load or variation change) * A product is added to cart (PDP) * An order reaches the end of checkout * An order is confirmed After installation, verify there are no JavaScript console errors on PDP, checkout, and confirmation pages. ## Anti-Bracketing Coming soon.