SAYSKY is a Copenhagen-born running brand founded in 2013. It makes high-performance apparel for runners who take their sport seriously, value good design, and still want to have fun on the run.
The brand brings together runners across different paces, ambitions, and places through its Worldwide Running Tribe. Its community is made up of people balancing work, life, training, and race goals, with a shared love of the sport and the people they meet along the way.


SAYSKY was looking for a way to increase conversions while reducing returns by giving shoppers more confidence in their sizing decisions before purchase.
The brand already gave shoppers size charts, model information, and detailed product descriptions across its range. A runner may know the size they wear in another brand and still be unsure how SAYSKY's fabric, compression, cut, and fit will translate once they are actually out on a run.
Runners do not always want the same fit for every piece they buy. What feels right for marathon training may not be what they want for an easy, light run on the beach.
In July 2021, SAYSKY launched Fit Quiz Size Recommender across all of their international Shopify stores.
To simplify and elevate the user experience, the traditional size guide was integrated directly into the Fit Quiz widget. This meant shoppers had a clear call-to-action on a product page and could just choose whatever worked best for them: take the quick interactive quiz, or look up their measurements on the standard size chart in the exact same spot.
Additionally, Fit Quiz automatically localized its interface based on the shopper's language preference, supporting up to 20 different languages. The quiz content (both questions and answers) and the final sizing recommendations were adjusted as well to match regional standards.


Fit Quiz Size Recommender helped SAYSKY to offer a smoother and more intuitive sizing experience. Product pages were made easier to navigate by combining Fit Quiz and a size guide into one call-to-action button. Shoppers got a choice between the interactive quiz and the traditional measurement-based size chart. The entire experience and size recommendations were localized for different countries and languages.
Fit Quiz now delivers product-specific sizing guidance as a native part of the shopping journey. Because the quiz adapts dynamically to the specific item being viewed, each recommendation accurately reflects that product's unique cut and style. Once a shopper completes the quiz for the first time, personalized recommendations are automatically shown to any other products they browse. Fit Quiz recalculates the ideal size in the background and adjusts it to each product and shopper.
"Sizing is incredibly important for high-performance running apparel, so we needed a solution that was easy to use, highly localized, and accurate. Fit Quiz delivered on all fronts, boosting customer confidence globally and driving higher sales conversions. We want every runner to experience their best run, and Fit Quiz plays an essential role in ensuring they start with the perfect fit"
