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No matter the season, its always a good idea tobring an extra jacketalong when youre heading outside.

Best base layers in 2024

Courtesy of the brands / Laneen Wells

An easy way to insulate yourself from the cold is by wearing some great base layersa.k.a.

thin, lightweight, long-sleeved shirts and tights that fit under the rest of your clothes.

We selected our top picks based on recommendations from SELF staffers and the experts we spoke to.

Smartwool Intraknit Active Base Layer Crew in pecan brown variant on a white background

Check them out below, then get psyched for your nextcold weather excursion.

Id have to sit out most of the fall climbing season without this shirt, our writer says.

Its snuglike, very,verysnugbut still moves with me.

Under Armour ColdGear Mock Long Sleeve in charcoal light heather variant on a white background

I run cold, and I can pile several more layers on top of it without feeling restricted.

Plus, its higher neckline helps keep frigid air out.

That offered the mobility I need when hiking and scrambling.

Kari Traa Rose Half-Zip Base Layer Top in roy variant on a white background

Theyre really soft and warm, but nottoowarm, she says.

Theyre not too tight and dont dig into your waist, and they wash well.

The leggings were not only warm, but were flexible and responsive with my movement.

Smartwool Classic Thermal Merino Base Layer Crew in marmalade heather variant on a white background

Ill be wearing these on more hikes and camping trips to come.

The Omni-Heat Tights are also a standout for one SELF staffer, whos looking forward to wearing them skiing.

These are way warmer than other base layers Ive tried, she says.

Janji Rover Merino Hoodie in midnight variant on a gray background

Theyre lightweight, fit perfectly, and have held up over time.

She also recommends the correspondingOmni-Heat Infinity Base Layer Crew shirtfor all-over lightweight warmth.

And the areas theydocover will be nice and warm, thanks to their soft-to-the-touch wool fabric and midweight insulation.

Athleta Ascent Seamless Top in magnolia white variant on original background

Theyre great for keeping me warm while walking the dog on cold days, one wrote.

Fit perfectly under long pantsno bunching up or sliding around.

Theres a lot to love about how these tights perform too.

Minus33 Lightweight Magalloway Merino Wool Bottom in charcoal gray variant on a light gray background

Their unique two-layer construction helps them retain warmth while managing sweat and keeping the fabric very lightweight overall.

One Helly Hansen reviewer called them shockingly warm for as thin as they are.

Columbia Omni-Heat Infinity Tights in black variant on a light gray background

Kari Traa Rose Capri High-Waist Base Layer Bottoms in taupe variant on a white background

Patagonia Capilene Midweight Base Layer Bottoms in smolder blue variant on a light background

Vuori Evolve Legging

Vuori Evolve Legging

Helly Hansen LIFA Merino Midweight 2-In-1 Base Layer Pants in yellow crea variant on a light background