How Under Armour cut size-based returns by 27% — across apparel and footwear

Under Armour Japan has been a Virtusize client since 2022. Here's what happened in just the first year.
CLIENT SINCE
Oct 2022
MARKET
Japan
CATEGORY
Sportswear & Footwear
MEASURED PERIOD
Oct–Dec 2022 vs. 2023
THE RESULTS
A measurable impact — in the first year alone
27%
Year-on-year reduction in size-based returns
Oct–Dec 2022 vs. Oct–Dec 2023
THE CHALLENGE
High returns, limited stores, and two product lines to solve

Under Armour Japan operates with fewer physical stores than most major apparel brands, making ecommerce the primary sales channel. That dependency made high return rates a direct threat to profitability.

The challenge was compounded by scope: they needed a solution that worked not just for apparel, but for footwear too — a single cohesive experience across both categories.

THE SOLUTION
Fit intelligence built into the existing journey

Virtusize integrated a size recommendation widget directly into Under Armour's purchase flow — covering both clothing and shoes — without adding friction to the checkout experience.

An analytics layer on top gave the team visibility into what was working. They monitored performance continuously, adjusting recommendation logic by product series to drive returns down further over time.

THE PRODUCT
One solution. Apparel and footwear covered.

Most fit tools are built for clothing only. Virtusize handles both — giving Under Armour a single integration that covers their full product catalogue, with personalised recommendations specific to each shopper’s measurements.

"Virtusize reduced our size-related returns by 27% year-on-year — across both apparel and footwear. Their frequent UI updates and continuous improvements to the size recommendation logic give us full confidence in the service. It has become an indispensable part of our website, and they continue to support our growth every step of the way."
Naoki Ito, Ecommerce Division
Under Armour Japan

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