In this experiment on a product screen, a message about quality (from the founders) was reformatted to reinforce the "Anti Hole Guarantee" (in the context of socks). The founders were also made more prominent and their signature added as well. Interestingly, the actual guarantee copy (and its important detail about a 6 month product replacement) was present further down on both the control and variation.

The translation of the new copy (Google Translate) reads:

Since we founded SNOCKS, the quality and comfort of our products have always been our top priority. Why? When we both were still studying, we didn't have the money to buy new socks & underpants every 1-2 months. That's why it was clear to us from the start that we wanted to sell quality products that are also extremely comfortable. And just in case something goes wrong, we have decided to introduce an anti-hole guarantee.

In this experiment a "Free Shipping & Returns" message was added just below the price information. 

This experiment replaced a visible coupon field with a dynamic text link that would initially hide the form field. Only after clicking the text link would the coupon form field appear. The translation from German is "Do you have a coupon code? Click here to apply". Impact on completed transactions was measured.

In this experiment, the variation has a "Back To Shopping Cart" link right underneath the checkout button. Impact on sales was measured.