How a 3,000+ SKU Apparel Brand Grew Ad Attributed Sales 165% on Amazon

This performance apparel brand specializes in sun-protective clothing designed for outdoor and warm-weather activities. Its catalog includes a wide range of products across men’s, women’s, and children’s apparel, resulting in a large and complex assortment with over 3,000 ASINs.

Operating in a seasonal category, the brand must balance inventory, visibility, and demand fluctuations while maintaining strong positioning across a highly competitive landscape.

The Challenge

By late 2025, the account was losing momentum.

Total sales had declined year over year, despite maintaining relatively efficient Advertising Cost of Sale (ACOS). This signaled a deeper issue: efficiency alone was not enough to sustain growth. Visibility and demand capture were deteriorating.

The root cause was structural.

With more than 3,000 ASINs, campaigns were spread too thin across the catalog. Budget was diluted, high-performing products were not prioritized, and the account lacked clear segmentation. This made it difficult to scale what was working or regain ranking on key products.

External pressures compounded the issue. Seasonal demand was declining, and inventory constraints limited flexibility during a critical period.

The account was not just underperforming—it was losing relevance.

Why Quartile

The problem was not a lack of effort. It was a lack of focus.

In large catalogs, treating every product equally creates inefficiency. Without clear prioritization, even well-optimized campaigns struggle to scale.

Quartile introduced a structured approach designed to restore control.

By organizing the account around product collections and prioritizing proven performers, Quartile created a system where budget and optimization aligned with business impact. This allowed the account to shift from diluted spend to concentrated performance.

The goal was simple: focus investment where it would drive the greatest return.

The Solution

Quartile rebuilt the account with a focus on structure and prioritization.

Campaigns were segmented by product collections, creating clearer performance visibility and control. Within each collection, emphasis was placed on best-selling and high-potential products, ensuring that budget flowed toward proven drivers.

The Quartile framework was then applied within these segments. A combination of automatic and manual bulk campaigns enabled both discovery and control—capturing new demand while reinforcing high-performing queries.

Defensive campaigns were introduced to protect branded search and maintain visibility on core ASINs. At the same time, Sponsored Brands campaigns supported collection-level awareness, driving traffic to priority product groups.

This approach fundamentally changed how spend was allocated. Instead of supporting the entire catalog equally, investment was concentrated on the products most likely to scale.

As a result, the system could learn faster, optimize more effectively, and regain lost momentum.

Results & Impact

The impact of the restructuring was both immediate and sustained:

• 46% month-over-month increase in total sales from November to December  

• ACOS improved from a high baseline to ~34% more efficient levels  

• 103% increase in total sales year over year in January  

• 165% growth in ad-attributed sales, signaling stronger demand capture  

Performance improved despite operating in a lower-demand seasonal period—demonstrating that structure, not just market conditions, was the key driver of recovery.

As highlighted in the January performance snapshot, order volume and units more than doubled year over year, reinforcing the strength of the turnaround.  

These results reflect a clear shift: by concentrating spend and restoring visibility on high-impact products, the brand moved from decline to scalable growth.

Ongoing Value & Future State

With a structured foundation now in place, the brand is positioned for continued growth.

Quartile continues to refine segmentation, expand high-performing collections, and optimize budget allocation across the catalog. The improved structure also enables faster adaptation to seasonal demand shifts and inventory changes.

What was once a fragmented system is now a scalable growth engine—built on clarity, prioritization, and performance-driven execution.