The Minnesota-based athletic-leisure brand drove up to +109% revenue lift per campaign and lifted click rates by +45% with Mailtail.
Klaviyo A/B test data, March 2026 — head-to-head sends with vs. without Mailtail
High-Intent Drops Buried Under Promotions
UNRL ships seasonal collections and high-profile collabs (including their official Minnesota Timberwolves partnership) where every send needs to convert in the first 24 hours. Even with strong open rates, click engagement was leaving meaningful revenue on the table.
Same Creative, Better Inbox Placement
UNRL ran three head-to-head A/B tests at 100% test size — same creative, same list, same send time, with and without Mailtail. The Mailtail variant won every test on every metric, all at 100% statistical win probability.
Campaign Results
Three head-to-head A/B tests across March 2026. Mailtail won every metric on every test.
New Youth — SS26
Flagship test · 111K sendsSS26 youth collection launch. ~56K sends per variant, statistically significant.
UNRL × Timberwolves Collab
Collab announcement · 39K sendsIn-arena exclusive waitlist announcement. ~19.5K sends per variant, statistically significant.
High Street II — SS26
Product launch · 112K sendsSS26 collection launch. ~56K sends per variant, statistically significant.
The Bottom Line
Across three A/B tests in March 2026, Mailtail won every test on every metric.
On the New Youth SS26 launch alone, Mailtail more than doubled revenue per send compared to the same email without Mailtail — with 100% statistical significance reported by Klaviyo.
All data from Klaviyo A/B testing reports, March 2026. Each test compared the same email creative with and without Mailtail at 100% test size, with statistical significance reported by Klaviyo at 100% win probability. Revenue figures reflect Klaviyo's placed-order attribution. Results may vary based on industry, list quality, and email practices.