When running in winter, every gram counts. The baselayer lies ultra-thin against the skin, absorbs sweat, and wicks it away. This prevents you from suddenly getting chilled at traffic lights or at the end of your run.

The mid-layer bridges the gap during the first few kilometers until your body reaches operating temperature, and then retains the heat within your system. It adds minimal bulk and doesn't restrict your running rhythm.

The insulation isn't just for the run itself, but for before and after. It keeps you warm during your warm-up and cool-down, when your body reduces heat production, and it's small enough to fit in any pocket.

The top layer keeps out wind and rain without trapping heat underneath. When running, it's the layer you have with you when the weather turns: light enough to barely notice, robust enough for wet winter months.

When running, you wear a single layer on your legs. It keeps your muscles warm without adding bulk and reliably wicks away moisture. Choose the length according to the temperature: from short tights to long, windproof versions.