Best Thermal Workwear (2026)

Cold on a British site rarely arrives as a hard frost. It arrives as a damp base layer at 10am, a wind through the scaffold at 2pm and an hour of standing still while you wait for a delivery. The kit that copes is the kit that deals with sweat and wind, not just temperature.

Base layers: merino or synthetic

A base layer's job is to move sweat away from your skin, because wet skin loses heat many times faster than dry. Merino wool does this well and stays warm even when damp, it does not smell after three days, and it is soft. It also costs more, wears through at the elbows faster, and takes longer to dry. Synthetic polyester or polypropylene wicks faster, dries in an hour on the van heater, and shrugs off a hundred washes; the trade-off is it stinks by lunchtime on a hard day. The Scruffs Pro Base Layer Top (around £25) and Scruffs Pro Base Layer Bottoms (around £25) are synthetic with flatlock seams, so a harness or knee pads do not rub the seam into your skin. We do not list a merino set; if you sweat little and hate the smell, merino is worth seeking out, and if you graft hard synthetic is the better tool.

Insulated jackets and what the standards mean

Two European standards cover cold-weather workwear. EN 342 is for clothing that protects against cold in the harder sense, tested as a garment or ensemble for thermal insulation and air permeability. EN 14058 is the lighter standard for cool environments. A jacket that carries EN 342, like the Portwest S463 Hi-Vis Winter Bomber Jacket (around £50), has been tested for insulation rather than described as warm. Most trade jackets are not certified either way, and that is fine; it just means you are going on fill and reviews. The Portwest S460 Hi-Vis Winter Traffic Jacket (around £45) is the shorter, higher-cut version for roadside work. The DeWalt Storm Waterproof Work Jacket (around £60) and Apache ATS Waterproof Padded Work Jacket (around £50) are padded waterproofs without hi-vis, the Apache in black for jobs where a yellow jacket is wrong. The Portwest PJ50 Hi-Vis 3-in-1 Pilot Jacket (around £80) and Portwest C465 Hi-Vis 3-in-1 Bomber Jacket (around £60) split into shell and liner so one purchase covers October to March.

Layering for site versus cab

On site you are moving and then you are not, so three layers you can shed and add beat one heavy coat: base layer, a fleece like the Portwest F300 Hi-Vis Reflective Fleece Jacket (around £25), then the bomber or 3-in-1 over the top. Scaffolders and roofers get the wind first, so the outer layer needs a windproof shell more than extra fill. In a cab the problem inverts. A padded bomber restricts your shoulders on the wheel, bunches under the seat belt and cooks you once the heater is up, and the S463 reviews say exactly that. Drivers do better in base layer plus fleece in the cab, with the insulated jacket on the passenger seat for the walk-round and the tail-lift. Our HGV driver thermal guide goes through a full winter outfit for the cab.

Hi-vis thermal

If your site or your road work demands hi-vis, the certification is EN ISO 20471, with classes based on how much fluorescent and reflective material the garment carries. The PJ50 carries it. Two-tone yellow and black jackets like the C465 look the part but are not always certified because the black panels reduce the fluorescent area; check the listing if compliance matters. Wearing a certified vest over a plain padded jacket is the simple fix.

Heated jackets

The DeWalt Heated Soft Shell Jacket Kit (around £130) runs heating panels off a DeWalt tool battery, so if you already own the platform the battery is free. On the high setting expect two to four hours before it is a soft shell again, and the soft shell is showerproof rather than waterproof. It is the right tool for static cold work such as a sparky in a plant room or a driver waiting on a bay, and the wrong one for a scaffolder who is warm ten minutes after starting. For the mistakes people make buying all of this, read our thermal workwear mistakes piece.