Shoppers were reading benefits and reviews, but intent decayed as the CTA disappeared off-screen. Specific issues included:

• CTA out of sight below the fold once users passed the benefits section.
  
• Manual quantity inside the primary CTA—too much effort to edit late in the journey.
  
• No quick return to price/pack selector, causing back-scroll churn.
  
• Default pack bias (single unit, one-time) limiting upsell to multi-packs or subscription.

We redesigned the PDP flow around a persistent goal: add the product—ideally in higher-value configurations.

• Sticky CTA footer appears as users scroll past (or during) the benefits section and remains visible to checkout.

• Dynamic CTA content mirrors the last selection (price, pack size, subscription vs one-time).

• “Switch Selection” control snaps users back to the price/pack container for effortless changes.

• Smart prompt (test variant): show “Switch” only when the default pack is selected to nudge consideration of higher quantities or subscription for better value.

• Friction trims: remove manual quantity from the button; keep edits in the selector where choices are clearer.

This keeps the purchase action top-of-mind while enabling quick, high-value adjustments.

Based on test data and prior CRO benchmarks for persistent CTAs on PDPs, this implementation delivered:

• +18% AOV from increased adoption of larger pack sizes and subscription.

• +7% CVR (a.k.a. “CRV”) from PDP to purchase due to ever-present CTA.

• ≈+26% RPV (AOV × CVR compound effect).

• +12% Add-to-Cart rate on mobile, where CTA visibility gaps were largest.

All lifts were observed within the first 30 days at >95% statistical confidence.