15 base layers for running if you want to get out in the cooler weather (that'll keep you warm, but not too warm)
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.
It's generally recommended to wear fewer layers, made from synthetic materials and to stay away from cotton as it absorbs and holds moisture. Merino wool is also a popular natural fabric, and surprisingly effective at keeping you warm, even when you sweat.
Should base layers be tight or loose?
Ideally, base layers can to worn under a mid-layer or a jacket, so you want it to be close-fitting and sit snug against your skin to retrain heat.
What is the best base layer for running?
We love Lululemon's Swiftly Tech 2.0 Long Sleeve – which is one of their hero run products – it's really the ultimate layering piece for transitional weather. The thumbholes provide that little bit of extra coverage, while the lightweight, sweat-wicking mesh fabric promises to keep you at the right temperature.
For those who prefer the performance benefits of merino wool, you can't go wrong with Tracksmith’s Brighton Base Layer – which stays warm even when wet.
When it comes to running in the cold of winter – or even in the transitional weather of autumn and spring – knowing which layers to wear when running is tough. Here are the best base layers for running in 2021.
Best overall base layer for running
Swiftly Tech 2.0 Long Sleeve, £68, Lululemon
Wear it on its own on a mild day or under more layers on a colder run, you can't go wrong with a Swiftly Tech 2.0. Made with Lululemon's Silverescent technology – a nylon yarn with silver bonded around it – this top is antibacterial and stops bacteria growth. Go ahead, get sweaty.
Best high-neck base layer for running
Betty Jacquard Base Layer Top, £55, Sweaty Betty
Ok, ok, so technically this is a base layer designed for skiing – but whether you’re hitting the snowy slopes or setting off to enjoy a wintry run, this super-stretchy, slim fit base layer with a high neck is made for effortless layering. And it's also got thumbholes to prevent sneaky draughts.
Best floaty base layer for running
Sweaty Betty Breeze Running Top, £75, John Lewis
For those looking for more of a floaty number, Sweaty Betty's Breeze top is up for the challenge. Spun from a polyester blend (meaning it’s light, breathable and moisture-wicking), slip it on to keep your performance high when temperatures are low.
Save when you shop for the best base layers for running with these John Lewis discount codes.
Best base layer for running for high visibility
Accelerate Long Sleeve, £25, New Balance
A staple base layer, New Balance's long sleeve is perfect for when there's a chill in the air. With a focus on fabrication, this lightweight top promises to help keep you dry and comfortable and seen when the darker evenings draw in. Will it be on constant rotation in your wardrobe? Yes.
Best Merino base layer for running
Brighton Base Layer, £83, Tracksmith
Lightweight and soft to the touch, Tracksmith’s merino long-sleeve base layer features thicker knit wool on the arms than on the body, as your extremities generally need a little more warmth when running. We love its seamless construction and flattering fit. And it’s sustainable, too.
Best Nike base layer for running
Nike Dri-FIT Run Division, £59.95, Nike
This long-sleeve design has a really soft feel and uses thumbholes for extended coverage. Engineered with Dri-FIT technology, this utilitarian, high-neck design offers sweat-wicking warmth in a relaxed fit.
Save when you shop for base layers for running with these Nike discount codes.
Best seamless base layer for running
Seamless Essential Long Sleeve, £57, Alo
Matching effortless comfort with technical performance, the Seamless Essential Long Sleeve from yoga brand, Alo, ticks all the boxes. Sleek, lightweight, airy fabric that wicks sweat and dries fast. It's also incredibly breathable with panels of mesh on the front and back.
Best base layer for speed sessions
Under Armour RUSH ColdGear Long Sleeve Top, £60, The Sports Edit
Cool weather doesn't stand a chance with Under Armour's RUSH ColdGear Long Sleeve Top. Featuring mineral-infused fabric, infrared technology and thumbholes, this top is made for intense training. We love the slightly cropped fit, and higher neck, too.
Best zipneck base layer for running
Básar Merino wool zipneck, £95, 66°North
Now before you take a look at the price and skip to the next option, it's worth remembering that even if you have the best running jacket in the world, if your base layer retains moisture then your jacket will become totally useless. This base layer from Icelandic brand 66°North is made from 100% Merino wool and has a little zipper at the neck for extra ventilation.
Best lightweight base layer for running
ON Running Performance Long-T, £69, The Sports Edit
With tactical seams, this base layer from Swiss running brand ON Running is made from temperature-regulating fabrication that's incredibly light and breathable yet also keeps you warm. Win, win.
Best base layer for running that won't break the bank
Adidas Cooler Long Sleeve Running Sweatshirt, £35, The Sports Edit
Pull on this crimson adidas Cooler Long Sleeve Running Sweatshirt and pound those pavements. Reflective details ensure you can be seen on dark mornings, while the crew neck shape and long sleeves with thumbholes maximise warmth.
Best slim fit base layer for running
Merino Blend Long Sleeve, £50, Hoka
Feel inspired to lace up and get out, no matter the temperature, with Hoka's Merino Blend Long Sleeve. Boasting temperature-regulating Merino wool in a slim distraction-proof fit, with a quick-dry feel.
Best chafe-free base layer for running
Women's Running Base Layer, £55, Runderwear
Find your stride in Runderwear's running base layer. This long sleeve top has a silky, lightweight feel, built-in hand warming mitts and high-performance heat control properties that make it ideal for intense sweat sessions.
Best Decathlon base layer for running
Craft Active Extreme Long Sleeve Women's Base Layer, £40, Decathlon
Crafts' versatile base layer in aqua blue is super-tight with flatlock seams, mesh inserts at armpits for enhanced ventilation and made from a special sweat-wicking Coolmax-Air fibre to keep you warm and stylish during the sweatiest of winter runs.
Best bamboo base layer for running
Vela Bamboo Long Sleeve Top, £45, Finisterre
Beat the chill in Finisterre's Vela Bamboo Long Sleeve Top. Made in a lighter, vegan alternative to merino wool, this super soft bamboo base layer has a comfy, relaxed silhouette, so you can stay cozy whatever the adventure.
