★★★★★ 4.7/5 from 1,200+ outside days

Borealis - Women's Thermal Fleece Athletic Pants

$144.00 USD

Color: Yellow

Yellow Black White

Size: S

S M L XL

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Soft, warm, and flexible—these thermal fleece athletic pants deliver cozy insulation and breathable comfort for winter workouts and everyday wear.

Thermal Fleece Fabric – Plush, insulating fleece provides reliable warmth in cold weather
Soft & Skin-Friendly – Smooth-touch texture feels comfortable against the skin
4-Way Stretch Blend – 6% spandex ensures flexibility and freedom of movement
Breathable & Moisture-Wicking – Keeps you dry and comfortable during light sports or daily activities
Lightweight Warmth – Heat-retaining without bulk for easy winter layering
Athletic Relaxed Fit – Designed for both comfort and mobility
Versatile Wear – Suitable for workouts, lounging, commuting, and outdoor activities

#ThermalFleecePants #WinterAthleticPants #FleeceJoggers #WarmWorkoutPants #CozyActivewear #StretchFleece

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Worn on 1,200+ outdoor days

Made for real trips

You don’t need hardcore gear to have a great weekend outdoors.

KIRI is built for easy trips, hiking, camping, and getting out without the hassle.

Comfortable. Simple. Ready when you are.

No overthinking. Just pack and go.

Everything you need for a last-minute escape.

Build your weekend setup. Buy 2 items, save 10%

Explore Collection

Excellent

4.7

/ 5

based on 1267 reviews

No-bounce fit is the real deal.

Took this on a 4-hour trail run and it doesn't shift even on technical downhill. Pockets fit my phone, gels, and keys without any bulk. Took this on a 4-hour trail run and it doesn't shift even on technical downhill. Pockets fit my phone, gels,... Took this on a 4-hour trail run and it doesn't shift even on technical downhill. Pockets fit my phone, gels, and keys without any bulk.

Dan K., 3 days ago

Thumb loops are a game changer.

Full coverage without having to think about it. Wore it fishing all day — no burn, no complaints. Full coverage without having to think about it. Wore it fishing all day — no burn, no complaints. Full coverage without having to think about it. Wore it fishing all day — no burn, no complaints.

Liam N., 3 days ago

Looks good on and off the trail.

I'm not a hardcore hiker just someone who walks a lot on weekends. This is the perfect throw it on and go layer. Lightweight, fits slim, doesn't look like gear. I'm not a hardcore hiker just someone who walks a lot on weekends. This is the perfect throw it on... I'm not a hardcore hiker just someone who walks a lot on weekends. This is the perfect throw it on and go layer. Lightweight, fits slim, doesn't look like gear.

James T., 4 days ago

Sip and keep moving.

I used to stop every 30 minutes to drink from my bag. Now I just sip and keep moving. The vest sits so close to my body I forget it's there. I used to stop every 30 minutes to drink from my bag. Now I just sip and keep moving. The... I used to stop every 30 minutes to drink from my bag. Now I just sip and keep moving. The vest sits so close to my body I forget it's there.

Asher T., 1 day ago

Forgot sunscreen existed.

Wore it on a 3-hour coastal walk. The hood stays put, the fabric doesn't overheat, and I got zero tan lines. Already ordered one for my sister. Wore it on a 3-hour coastal walk. The hood stays put, the fabric doesn't overheat, and I got zero tan... Wore it on a 3-hour coastal walk. The hood stays put, the fabric doesn't overheat, and I got zero tan lines. Already ordered one for my sister.

Sarah M., 2 days ago

First vest that doesn't fight me.

Been through 3 hydration vests and this is the first one that feels like it's working with me, not against me. Been through 3 hydration vests and this is the first one that feels like it's working with me, not against... Been through 3 hydration vests and this is the first one that feels like it's working with me, not against me.

Luke F., 5 days ago

Dried within minutes on a steep climb.

Poured sweat on a steep climb and was dry within minutes of hitting the ridge. Quick-dry fabric is no joke. Poured sweat on a steep climb and was dry within minutes of hitting the ridge. Quick-dry fabric is no joke. Poured sweat on a steep climb and was dry within minutes of hitting the ridge. Quick-dry fabric is no joke.

Ben H., 8 days ago

Already bought one for my partner.

This is the zip top I've been looking for. Not too fitted, not baggy, moves with you everywhere. This is the zip top I've been looking for. Not too fitted, not baggy, moves with you everywhere. This is the zip top I've been looking for. Not too fitted, not baggy, moves with you everywhere.

Cheryl M., 2 days ago

Dried faster than I expected.

Took it on a morning trail run. It was warmer than expected and I was nervous about overheating but the fabric dried so fast I barely noticed the sweat. Really impressive. Took it on a morning trail run. It was warmer than expected and I was nervous about overheating but the... Took it on a morning trail run. It was warmer than expected and I was nervous about overheating but the fabric dried so fast I barely noticed the sweat. Really impressive.

Michelle K., 1 day ago

Activewear that doesn't look sloppy.

Finally an activewear top that looks put-together. Slim enough to look great, stretchy enough that nothing feels restricted. Finally an activewear top that looks put-together. Slim enough to look great, stretchy enough that nothing feels restricted. Finally an activewear top that looks put-together. Slim enough to look great, stretchy enough that nothing feels restricted.

Amy R., 6 days ago

Great light, wish it had a dimmer.

Really happy with this. Bright, compact, easy to use. Only thing missing is a dimmer setting for when you just want a soft glow at night. Full brightness is a lot. But for the price, excellent. Really happy with this. Bright, compact, easy to use. Only thing missing is a dimmer setting for when you just... Really happy with this. Bright, compact, easy to use. Only thing missing is a dimmer setting for when you just want a soft glow at night. Full brightness is a lot. But for the price, excellent.

Nathan B., 16 days ago

The two-size set is perfectly thought out.

One cup for cooking, one for drinking. They nest perfectly and cover everything you need. No more packing multiple containers. This is the kind of simple, smart gear I love. One cup for cooking, one for drinking. They nest perfectly and cover everything you need. No more packing multiple containers.... One cup for cooking, one for drinking. They nest perfectly and cover everything you need. No more packing multiple containers. This is the kind of simple, smart gear I love.

Alex M., 7 days ago

Small but incredibly bright.

Did not expect this much light from something this small. Hung it in the tent and it lit up the whole space. Battery lasts way longer than I expected too. Perfect camping light. Did not expect this much light from something this small. Hung it in the tent and it lit up the... Did not expect this much light from something this small. Hung it in the tent and it lit up the whole space. Battery lasts way longer than I expected too. Perfect camping light.

Jake T., 14 days ago