Cold winds, sea spray, and long hours on the water can make sailing uncomfortable without the right gear. That’s why the Zerofit Heatrub Ultimate Baselayer has become a trusted choice for sailors looking to stay warm and comfortable in challenging conditions.
Independently proven to be five times warmer than a standard baselayer, the Heatrub Ultimate is designed to perform in temperatures as low as -10°C. Its advanced Heat Thread technology generates warmth instantly as you move, helping you stay protected from the cold from the moment you step onboard.
Unlike many traditional baselayers, the Ultimate doesn’t rely on tight compression to trap heat. Instead, it delivers warmth while allowing complete freedom of movement—ideal when working around the deck, adjusting sails, or spending long days at sea.
Its soft, flexible fabric also makes it comfortable enough to wear all day, whether you’re racing, cruising, or simply enjoying time on the water. And because it provides exceptional warmth, you can wear fewer bulky layers and move more naturally in changing weather conditions.
For sailors who refuse to let the cold keep them ashore, the Zerofit Heatrub Ultimate is the perfect companion for every adventure on the water.
Independently tested at the famous Boken Institute in Osaka, the Heatrub Ultimate Baselayer was proven to be five times warmer than leading baselayers, making it a trusted choice for fishing, hiking, motorcycling, golf, skiing, hunting, sailing, and other outdoor adventures.
In Heat Retention Testing, the Ultimate achieved an impressive rating of 0.78, compared to just 0.1–0.14 for a standard baselayer and around 0.3 for a typical sweater.
The secret behind its performance is Zerofit’s advanced Heat Threads, woven inside the garment. Activated through movement, these soft fibres gently brush against the skin to generate warmth instantly.
Unlike many traditional baselayers that rely on tight compression to trap heat, the Ultimate delivers exceptional warmth without restricting movement. The result is a baselayer that feels comfortable, flexible, and ready to perform in temperatures as low as -10°C.
Developed in Japan, Zerofit – The World’s Warmest Baselayer® – has quickly gained a loyal following across Europe and North America. Outdoor enthusiasts everywhere are discovering the incredible warmth and comfort of the Heatrub Ultimate Baselayer ($90), Heatrub Leggings ($90), and Heatrub Socks ($29).
At the same time, runners, cyclists, footballers, and hockey players have embraced the versatility of the Heatrub Move Baselayer ($76), thanks to its adaptable warmth, temperature regulation, and innovative no cold sweat technology that helps keep athletes comfortable during training and competition.
