★★★★★ 4.7/5 from 1,200+ outside days
Flow-Cool Long Sleeve · UV Protection
Cool to the touch. Built to keep up with you.
Why You'll Love It
- UPF 50+ UV protection Blocks harmful rays with UVA transmission under 5%
- Cooling fabric technology Cool-touch feel that helps heat dissipate as sweat evaporates
- Antibacterial treatment Keeps odor in check through long hours of wear or activity
- Quick-dry performance Moisture-wicking fabric that dries fast during movement
- Slim-fit stretch construction Contours to the body without ever feeling restrictive
- Stand collar design Clean, structured look that also blocks wind at the neck
- Functional chest pocket Real storage built into a sporty silhouette
- Intended use Tennis, cycling, running, or any high-activity day in the sun
Description
Sun protection that doesn't mean overheating. Slim fit that doesn't mean restriction.
The Flow-Cool Long Sleeve pairs UPF 50+ UV protection with cooling fabric technology, so you stay covered and comfortable even when the activity ramps up. Antibacterial treatment keeps things fresh through long wear, while quick-dry, moisture-wicking performance handles the sweat before it becomes a problem. The slim-fit, stretch construction and raglan sleeve design move with you rather than against you, finished with a clean stand collar and a functional chest pocket for the essentials.
Made to move. Easy to wear.

What Customers Say About KIRI
Excellent
4.7/ 5
based on 1267 reviews
Bought for the color, stayed for the fit
honestly just liked how they looked lol. wore them hiking then didn't change before going to dinner and no one clocked it honestly just liked how they looked lol. wore them hiking then didn't change before going to dinner and no one... honestly just liked how they looked lol. wore them hiking then didn't change before going to dinner and no one clocked it
Maya G., 3 days ago
One shirt for gym and runs now
One shirt for gym and runs now — don't need a separate one for each anymore, dries quick between sets too One shirt for gym and runs now — don't need a separate one for each anymore, dries quick between sets... One shirt for gym and runs now — don't need a separate one for each anymore, dries quick between sets too
Kayla J., 1 week ago
Pockets fit more than i thought
pockets fit more than i thought — phone + snacks + map, no bulk. also just wore it around town and it worked fine there too pockets fit more than i thought — phone + snacks + map, no bulk. also just wore it around town... pockets fit more than i thought — phone + snacks + map, no bulk. also just wore it around town and it worked fine there too
Ivy S., 1 week ago
Light enough i forgot i had it on
Which sounds like a throwaway compliment but it's not, most sun jackets feel like a tarp Which sounds like a throwaway compliment but it's not, most sun jackets feel like a tarp Which sounds like a throwaway compliment but it's not, most sun jackets feel like a tarp
Noah V., 1 week ago
Hiked a super exposed trail, zero sunburn
No shade for hours and i was fine. the little vent holes actually do something apparently No shade for hours and i was fine. the little vent holes actually do something apparently No shade for hours and i was fine. the little vent holes actually do something apparently
Lea H., 4 days ago
No gross smell after a 2hr ride
No gross smell after a 2hr ride — this is the real test for me honestly and it passed. usually my stuff reeks by hour 2 No gross smell after a 2hr ride — this is the real test for me honestly and it passed. usually... No gross smell after a 2hr ride — this is the real test for me honestly and it passed. usually my stuff reeks by hour 2
Devon R., 4 days ago
Stretchy enough for the scramble parts
did a pretty steep trail and never felt like i was fighting the fabric. that's rare tbh did a pretty steep trail and never felt like i was fighting the fabric. that's rare tbh did a pretty steep trail and never felt like i was fighting the fabric. that's rare tbh
Claire M., 4 days ago
Hood stayed put in actual wind
hood stayed put in actual wind — was up on a ridge and it got windy fast, hood didn't budge. wasn't expecting that from something this light hood stayed put in actual wind — was up on a ridge and it got windy fast, hood didn't budge.... hood stayed put in actual wind — was up on a ridge and it got windy fast, hood didn't budge. wasn't expecting that from something this light
Ryan C., 5 days ago
Good call packing these
weather was iffy on my trip and these just shed the rain, never got that heavy wet-pants feeling weather was iffy on my trip and these just shed the rain, never got that heavy wet-pants feeling weather was iffy on my trip and these just shed the rain, never got that heavy wet-pants feeling
Eli D., 1 week ago
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., 1 month 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., 6 days 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., 12 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., 13 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., 18 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., 12 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., 5 days 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., 15 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., 1 month 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
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.
Everything you need for a last-minute escape.
Build your weekend setup. Buy 2 items, save 10%
Seen on real weekend trips






