15 Best Base Layers for Running in 2021

When the sun is shinning, dressing for a run doesn’t require much deliberation. You just chuck on a sports bra, a pair of running shorts and a t-shirt… and away you go. But as soon as the temperature plummets, you need to start pulling together a different kit, including base layers for running, running jackets, hats and gloves. All without overdressing. (Because if you’re already warm when you start running, you’ll be sweating like crazy before long – and no one wants that). 

Your winter running kit needs to keep you warm (but not too warm). And the first line of defence against the winter chill are base layers made of technical fabrics.

What is a base layer for running?

A base layer is essentially a long-sleeve running top that, on a cool day, can be worn as your only layer. The colder it gets = the more layers you need. 

Thinner base layers are great to wear with lighter insulation options, such as running gilets or lightweight jackets. But when the temperature drops to below freezing you might want to pair a base layer with a more insulated outer-layer or pop on an extra mid-layer underneath a shell jacket. 

One thing to keep in mind though – factor in the intensity of your exercise when choosing your layers. If you're heading out on a tempo run, or speed session at the track, you'll want to opt for lighter layering.

What material should a base layer be?

A base layers' main role is to wick sweat away from your skin to help your body maintain its regular temperature, so you want something that's made from technical fibres to keep you comfortable.

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