The Challenge

Following a significant global repositioning to become a multi-specialist brand, Decathlon sought to launch a comprehensive full-funnel media campaign designed to drive awareness, site traffic, and sales for its Spring product range. The primary business objective was to move beyond standard performance metrics and deliver meaningful growth across the entire marketing lifecycle, from building Brand Love (awareness) and Brand Desire (consideration) to driving Brand Action (conversion). The challenge required navigating a complex landscape across a single market but involving five different platforms and the need for high-speed execution to go from briefing to live in less than four weeks.

The Solution

Fifty addressed this brief by moving away from generic, off-the-shelf segments and instead used their unique audience intelligence platform to build 16 custom audience groupings or "Tribes" that represented Decathlon’s audience heartland and its greatest growth opportunities.

The Fifty team focused the strategy on five distinct audience Tribes: Mainstream Active Dads, Intrepid Adventurers, Creative Gen Z, Dedicated Runners, and Keen Cyclists. Fifty’s unique intelligence allowed for deep granular understanding, for instance, identifying that Creative Gen Z prioritises authentic brands and visually appealing creative, while Mainstream Active Dads value family-oriented outdoor activities. This intelligence was immediately actionable; Fifty deployed 480 creative variants tailored to these specific motivations and leveraged AI-enabled custom segments on YouTube to scale reach while maintaining high engagement.

“Fifty's audience-led approach and ability to move at speed fundamentally changed our performance. Their deep insights allowed us to reach new growth audiences and the results speak for themselves: surpassing targets with 4243% ROI on conversion and securing them as our media agency of record.”

Marketing Team Decathlon

The Results

The collaboration between Decathlon and Fifty delivered a profound business impact that far exceeded initial expectations and established a new high-water mark for campaign performance. The most significant outcome was the generation of a staggering +1157% over-delivery on forecasted transactions. This commercial success was underpinned by a remarkable 1,090% ROI driven by a 25% conversion rate. These figures were driven by a Meta conversion rate from click to purchase that was 15x higher than the provided benchmark, proving that Fifty’s unique audience intelligence provides a significant competitive edge in the auction.

Beyond direct sales, the campaign significantly supercharged brand awareness, delivering 58.6 million impressions, a 122% increase over the forecast. Fifty’s ability to move with agility was a key factor in this success; by identifying the lower-funnel benefits of programmatic display early, the team shifted budget mid-campaign to maximise both reach and sales. Furthermore, the campaign demonstrated the superior accuracy of Fifty’s Tribes, which consistently outperformed Meta’s own lookalike audiences and even Decathlon’s internal retargeting pools in several instances. This partnership has provided Decathlon with a sophisticated, repeatable blueprint for future growth, grounded in a deeper understanding of human behaviour.