F-02
The “Add to cart” button is below the fold on mobile
What we found
On the iPhone 17 we tested, the Add to cart button on your top-selling product page sits 142 pixels below the fold. Visitors have to scroll past three blocks of copy and the size selector before they see the buy button at all.
Why it matters
Mobile shoppers form their buy-or-leave decision in the first two seconds. If the action they came for is not visible, the page reads as browsing content rather than a product page. We typically see this single issue account for 8 to 14 percent of mobile add-to-cart loss.
Our recommendation
Lift the price, the size selector and the Add to cart button into the first viewport on mobile. Push the product description and reviews down. This is a CSS-only change that takes roughly 0.5 to 1 hour of developer time.

