The Heatrub Ultimate Baselayer is back—and ready for winter. Available now in all sizes and colours, it delivers reliable warmth in temperatures as low as -10°C.
To back up its performance, we sent the unisex Ultimate ($90.00) for independent testing at the renowned Boken Institute, Osaka. The result? Proven warmth you can trust when conditions turn cold. It was FIVE TIMES WARMER than a standard baselayer. Here’s the science behind the award-winning product.
Claiming that the Ultimate is five times warmer than a standard baselayer naturally raises questions—which is exactly why we made independent testing a priority.
For context, a typical baselayer has a Heat Retention Rating between 0.1 and 0.14. In comparison, the Heatrub Ultimate achieved an impressive score of 0.78 during independent testing.
This level of performance makes a real difference in everyday life. It’s trusted by anglers, farmers, hikers, motorcyclists, campers, golfers, sailors, skiers, scuba divers, and many other outdoor enthusiasts who need reliable warmth in challenging conditions.
It’s also becoming a popular choice for everyday wear, especially for those looking to stay warm at home while helping to keep heating costs down.
Traditional baselayers usually depend on tight compression to trap body heat. The problem is, they can feel restrictive—and the warmth doesn’t always kick in straight away.
That’s where the Heatrub Ultimate changes the game.
Zerofit founder Mr Koji Higashi wanted something better: a baselayer that works without needing to be uncomfortably tight. The result is a specially engineered fabric that actively generates warmth instead of just trapping it.
The innovative Heat Threads activate the moment you wear it, giving you instant comfort and warmth—while still feeling soft and easy to wear for long periods.
With the Ultimate proving so popular, we created matching Heatrub Ultimate BASE LAYER ($90.00), Heatrub Ultimate Socks ($29.00) and Leggings ($90.00) which utilise the same Heat Threads s they perform in the same way as the top.
