Tourmaster Synergy Heated Liner

The Synergy Heated Liner draws 12V DC power from the bike's electrical system to run heating panels across the chest, back and collar, built into a polyester shell weighing around 500g. It's designed as an innermost layer, worn against the skin so heat transfers efficiently before being trapped by the jacket over the top. Adjustable heat settings are handled through an inline or bike-mounted controller, which is sold separately, so the liner alone doesn't include everything needed to run it straight out of the box. The shell fabric adds a degree of wind resistance and water resistance on its own, ahead of any heating being switched on at all. That extra hardware requirement is worth knowing before buying rather than after.

Stretch panels at the underarms and back keep the liner moving with the body rather than restricting it, and the slim profile means it layers under mesh jackets, textile suits or leather gear without adding noticeable thickness underneath. The quick-connect power cord uses a weatherproof plug, though its placement can be awkward to route on your own the first time it's fitted. Once wired in, the heat comes on quickly and spreads evenly rather than creating hot spots, though the lowest setting can feel inconsistent compared with medium and high. Riders installing the liner for the first time should expect to spend some time routing the cable neatly rather than expecting a plug-and-forget setup.

This suits touring riders and commuters extending their season into colder months who are prepared to budget for the extra controller and harness rather than expecting a plug-and-play product straight away. As a base layer rather than an outer jacket, it preserves whatever armour and abrasion protection sits in the rider's existing gear underneath. Riders wanting a simpler, battery-only heated garment without wiring into the bike, or a more even low-setting output, may want to compare it against rival heated liners before committing to the extra wiring cost. Anyone unsure about wiring into their bike's electrical system may prefer to start with a battery-only heated garment before committing to a fully integrated setup like this one.