The World’s Warmest Baselayer® Love the outdoors but hate the cold? The Heatrub Ultimate unisex baselayer is designed to keep you warm and comfortable, no matter the conditions.
Perfect for skiing and other cold-weather activities, it acts as a reliable companion whenever you head outside. It doesn’t just protect you from the cold—it also allows you to move freely, without the tight, restrictive feel of many traditional baselayers.
The Zerofit Heatrub Ultimate Baselayer is built for all kinds of outdoor winter activities—whether you’re fishing, cycling, sailing, hiking, bird watching, horse riding, gardening, or playing golf.
Independently tested at the Boken Institute in Osaka, Japan, it has been proven to be five times warmer than leading baselayers. It achieved an impressive heat retention rating of 0.78, compared to just 0.1–0.14 for standard baselayers and around 0.3 for a typical jumper.
Inside the garment, advanced Heat Threads are activated as you move, gently interacting with your skin to generate warmth instantly.
Unlike most baselayers that rely on tight compression to trap heat, the Heatrub Ultimate takes a different approach—delivering superior warmth without restricting your movement. This means you stay comfortable and free to move, no matter your activity.
Designed to perform best in temperatures ranging from -10°C to 10°C, it’s a true game-changer for anyone who loves spending time outdoors.
The same Heat Thread technology is also used in the Heatrub Ultimate socks, working in exactly the same way to keep your feet warm, comfortable, and protected in cold conditions.
For added practicality, the socks feature non-slip nano dots on the sole, helping to improve grip and stability. It’s a small detail that makes a big difference—and one that’s proven popular across a wide range of sports and outdoor activities this winter.
Zerofit baselayer is the perfect companion for cold weather. It keeps you warm and protected, even in freezing conditions, so you can enjoy your favourite outdoor activities without discomfort.
With Zerofit USA, you can easily get your hands on the authentic Heatrub Ultimate and experience reliable warmth all season long.
