Jules puts Kleep and Fitle head-to-head on live traffic. Kleep stays.

Born in northern France and part of the Lille-based Fashion Cube group, Jules is one of the country's largest menswear retailers, hundreds of stores and a major e-commerce operation dressing millions of men in accessible, well-cut essentials. The brand's proposition is democratic style without fuss: chinos, shirts, knits and, above all, denim, a jeans wall deep enough that finding your cut in-store traditionally required a changing room and patience. Jules operates at the volume where small frictions become big numbers, and its digital team has a house culture of testing rather than believing: tools earn their place on the storefront with data. That culture extends across the group, Fashion Cube's brands share infrastructure decisions, so a technology that proves itself at Jules rarely stays at Jules. It is retail at industrial scale, run by people who read dashboards before decks.

Denim is where fit tools go to die. Rise, stretch percentage, leg shape and intended fit interact in ways that make a generic recommendation worse than none, a slim in one fabric is a straight in another, and a shopper burned once by bad guidance never opens the widget again. Jules knew this intimately: it already had fit technology in place with Fitle, and a healthy scepticism about switching. Ripping out an integrated tool carries real cost, and a marginal improvement wouldn't justify it. The digital team's position was simple and entirely fair: if Kleep believed its engine was better, it could prove it the hard way, on Jules's own traffic, head-to-head against the incumbent, with the jeans wall as the battlefield. The bar was not 'good sizing guidance'. The bar was measurably beating a live, established competitor at the category where sizing is hardest.

Jules put Kleep and Fitle head-to-head on live traffic and let the data decide. Kleep's arm ran its full stack: the two-photo body scan, built on body-measurement research developed with the Mines de Paris and ENS Paris-Saclay laboratories, or a quick questionnaire, feeding per-garment calibration that treats each denim cut, fabric and stretch level as its own sizing problem. The experience was tuned for Jules's shopper: two clicks from product page to the right jeans fit, inside a white-label interface that reads as Jules, with recommendations served in under 250 milliseconds. No novelty placement, no favourable conditions, the same storefront, the same period, the incumbent fighting on home turf. For a category where academic-grade body measurement genuinely matters, the science underneath the scan was the differentiator Kleep was betting on.

Kleep won the A/B test, and the decision was confirmed in July 2026, not just for Jules, but together with its sister brand BZB, two Fashion Cube storefronts switching on the same evidence. The incumbent's home-turf advantage did not survive contact with the data: shoppers guided by Kleep's scan-driven recommendations reached their jeans fit in two clicks, and the downstream numbers made the case that scepticism had demanded. The Jules verdict completes a pattern that now defines how Kleep wins: head-to-head against True Fit at ba&sh, against Fit Analytics at Intersport, against Fitle at Jules, three incumbent vendors, three live A/B tests, three replacements decided by the client's own traffic. For France's biggest menswear jeans wall, the changing-room problem now has a two-click answer, backed by research-lab measurement science and proven the only way Jules would accept: in production, against the best available alternative.