SIZD adds a "Try it on" button to your product pages. Shoppers upload one full-body photo and see a realistic image of themselves wearing the product in seconds. Built-in size recommendations read body proportions and suggest the size from your size chart. The widget drops in via a theme app block - no developer needed. Photos are encrypted, used only for the requested try-on, and auto-deleted after 30 days. GDPR data-request and erasure flows are wired in.