• Cloudline merino wool ultralight hiking sock in Slate Blue, part of the hiking sock sampler 3-pack
  • Cloudline Merino Wool Hiking Sock - Ultralight - Teal
  • Cloudline Merino Wool Hiking Sock - Ultralight - Granite
  • Cloudline Merino Wool Hiking Sock - Ultralight - Hi-Vis Orange
  • Cloudline Merino Wool Hiking Sock - Ultralight - Backcountry Blue
  • Cloudline Merino Wool Hiking Sock - Ultralight - Midnight
  • Women wearing Cloudline merino wool hiking socks, backpacking through forest trail.
  • Trail runner wearing Cloudline merino wool hiking socks running fast.
  • Women wearing Cloudline merino wool hiking socks crouched next to backpacking stove lifting pot lid.
  • Close up of cloudline merino wool sock worn by women on trail with mountain in distance.
  • Hiker wearing Cloudline merino wool hiking socks and sandals sitting on rock above lake.
  • Hiker wearing Cloudline merino wool hiking socks and sandals on trail.
  • Backpacker wearing Cloudline merino wool hiking socks trekking up steep trail with walking stick.
  • Close up of Cloudline logo on merino wool hiking socks worn by women resting by trail.
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CLOUDLINE

Women's Merino Wool Hiking Sock - Ultralight

Women's Merino Wool Hiking Sock - Ultralight

$ 22.99 USD
$ 22.99 USD $ 22.99 USD
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CrewUltralightBest for hot weather and trail runners

Size
Color
Women's Merino Wool Hiking Sock 3-Pack - Ultralight Save with the 3-pack 3 pairs for $ 58.99, save $ 9.98. One pair to wear, one drying, one in reserve.

Women's Merino Wool Hiking Socks - Ultralight Crew

Staying cool and comfortable on the trail is no small task, but Cloudline's women's ultralight merino wool hiking socks are designed for hikers who prefer a lightweight feel on the trail. These crew hiking socks blend comfort and breathability for dry, comfortable feet, making them ideal for both cool nights and warm trail hikes.

Cloudline's merino wool is naturally moisture-wicking and odor-resistant, keeping your feet fresh from the first mile to the last. The ultralight construction delivers a barely-there feel underfoot, while the crew height provides ideal coverage on brushy, dense trails. A precision fit means these socks stay up all day without slipping or bunching, which helps prevent blisters.

Knit in the USA. Every pair is knit at Shankles Hosiery in Fort Payne, Alabama, once known as the Sock Capital of the World.

What it's made of. 59% merino wool, 34% nylon and 7% spandex. Our merino is RWS (Responsible Wool Standard) certified, the nylon makes the sock far more durable than 100% wool, and the spandex keeps the fit snug.

Trail tested. Thru-hiker tested on the Pacific Crest Trail and Appalachian Trail, and on our home trails in Olympic National Park and around Mount Rainier.

Guaranteed for life. If your socks ever wear out, we'll replace them under our Lifetime Guarantee.

Stock up with our women's merino wool hiking socks and always have a fresh pair ready for your next adventure. Perfect for hiking, backpacking, trail running, and warm weather outdoor activities.

  • Compostable Shipping Materials
  • Carbon Neutral Shipping
  • Free Exchanges and Returns
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Customers are saying

4.87 ★ (3757)
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SOCK FEATURES


▪︎ Long, hot hikes call for moisture-wicking socks. Our merino wool blend wicks your sweat away, keeping your feet cool, dry and comfortable.


▪︎ Enjoy your post-hike high even more with socks that don’t stink. Cloudline socks are naturally odor resistant and keep your feet smelling fresh.


▪︎ We’ve built these socks to be comfortable and durable, so you can expect itch-free bliss every time you put them on. A reinforced heel and toe add extra strength where your feet need it most.


▪︎ When you’re chasing the cloudline, the weather can change on a dime. Our temperature regulating merino wool blend ensures your feet stay comfortable all day long.


▪︎ These socks are trail tested in the varied terrain of the Pacific Northwest.

SOCK DETAILS


▪︎ American Made from Quality Materials: The perfect blend of 59% Ultra Soft Merino Wool, 34% Nylon, and 7% Spandex.


▪︎ Ultralight weight: Built for all-day, breathable comfort on warm-weather hikes.


▪︎ Crew Height: Our most popular height rises to mid-calf and stays up all day.


▪︎ Easy Care: Always wash inside out to prevent pilling. Machine wash cold to warm and tumble dry on low to warm heat. Do not bleach. Can also be hand washed and line dried on the trail.

CARE INSTRUCTIONS

Turn inside out and machine wash cold or warm with like colors. Skip bleach and fabric softener. Tumble dry low to warm or line dry, and never iron. Read the full care guide

LIFETIME GUARANTEE

Every Cloudline sock is covered for life, with no time limit. If you wear out a pair, our team will send you a code for a free replacement. You just pay $4.95 shipping, or it's free on orders over $50. How the guarantee works

Frequently Asked Questions

What size should I get?

Women's sizes follow your US shoe size: Small fits 4 to 6.5, Medium fits 7 to 9.5, Large fits 10 to 12.5, and X-Large fits 13 to 15. If you're between sizes, size down, since the merino and spandex blend stretches for a snug fit. If you have wide or high-volume feet, size up. See the full size guide.

When should I choose ultralight?

Ultralight has no cushion, just a thin knit, so it's our coolest and most breathable hiking sock. It's best for summer hikes, hot climates and snug shoes, and the merino still wicks sweat and resists odor. For more padding underfoot, try our Light Cushion. For boots and cold weather, Medium Cushion is warmer. Our cushion guide compares all three.

Will they shrink in the wash?

Every Cloudline sock is washed and preshrunk before it's packaged, so the fit stays consistent. High dryer heat can still shrink wool over many washes, so tumble dry on low to warm heat or line dry.

How should I wash them?

Turn them inside out, machine wash cold or warm with like colors, and tumble dry on low to warm heat. Skip bleach and fabric softener, because softener can reduce wicking. On the trail they hand wash and air dry quickly. Full tips are in our washing guide.

What does the lifetime guarantee cover?

If your socks ever get a hole, or your dog eats your favorite pair, send us the guarantee form with your order number, or the name and email you ordered with. Our in-house team will replace them.

How do these compare to Darn Tough and Smartwool?

All three make excellent merino hiking socks. This one is 59% merino, 34% nylon and 7% spandex. It's knit in Fort Payne, Alabama and backed by a lifetime guarantee, at $22.99 a pair or $53.99 for a 3-pack ($18 a pair). See our side-by-side comparison of durability, guarantees and value.

Why isn't the merino percentage 80% if the yarn is 80% merino?

Every Cloudline sock is knit from the same yarn: 80% RWS certified merino wool and 20% nylon. The nylon makes the yarn much more durable, since 100% merino wears through quickly. The fiber content on each sock also counts the nylon reinforcement and the spandex that keeps the fit snug. That's why the merino percentage changes a little from style to style.

Compare hiking sock cushion levels

Every pair is knit in Fort Payne, Alabama from the same yarn: 80% RWS certified merino and 20% nylon for durability. Fiber content shifts with the cushion, reinforcement and stretch, so pick the padding that fits your shoes and season.

You're viewing

Ultralight

Cushion
No cushion, our thinnest knit
Warmth
Coolest
Best for
Hot summer trails and trail runners
Fiber content
59% merino, 34% nylon, 7% spandex

$ 22.99 a pair

Light Cushion

Cushion
Padding underfoot, thin breathable upper
Warmth
Balanced
Best for
Day hikes and light hikers, spring to fall
Fiber content
63% merino, 31% nylon, 6% spandex

$ 23.99 a pair

Shop Light Cushion

Medium Cushion

Cushion
Padded throughout the whole sock
Warmth
Warmest
Best for
Long days, heavy packs, boots and cold weather
Fiber content
63% merino, 33% nylon, 4% spandex

$ 24.99 a pair

Shop Medium Cushion

Still deciding? Read our cushion guide.

The Cloudline Lifetime Guarantee

Wear a hole in them. We'll replace them. For life.

No time limit. Holes, worn-out heels and toes, even the pair the dog got to. It covers every Cloudline sock.

How the guarantee works
  1. 1Wear them hardHike, run, work and travel in them.
  2. 2Send us a quick messageYour order number, or the name and email you ordered with.
  3. 3Get your replacement codeThe replacement pair is free. Pay $4.95 shipping, or add a few pairs and ship free over $50.
Sock knitting machines at the mill in Fort Payne, Alabama, where Cloudline socks are knit
Made in the USA

Knit in the Sock Capital of the World

Every Cloudline sock is knit in Fort Payne, Alabama, the town that earned the name Sock Capital of the World. We design and trail test them in Seattle, where coastal trails, rainforest and glacier peaks are all a day trip away.

Responsible merinoRWS certified wool from audited farms that care for their sheep and their land. No mulesing.
Carbon-neutral shippingWe offset the shipping emissions of every order with carbon removal through Shopify Planet, at no cost to you.
Compostable mailersYour socks arrive in a home compostable mailer, so the packaging can go in your backyard compost instead of the landfill.

Why merino wool socks?

Cool in heat, warm in cold

Merino adapts to your effort and the weather, so one sock works from desert miles to winter trails.

Dry feet, fewer blisters

It wicks sweat away from skin, which is why it works for sweaty feet and long days in boots.

Naturally odor resistant

No chemicals or metals added. Kick your shoes off at the end of the day with confidence.

Soft, not itchy

Fine-gauge merino yarn feels nothing like the scratchy wool socks you remember.

Best-selling women's merino wool socks

The pairs our customers reorder most.

Women's Merino Wool Hiking Sock - Medium CushionBest seller
4.94 (104 reviews)Women's Merino Wool Hiking Sock - Medium CushionBackpacking and cooler days$ 24.99
Women's Merino Wool Hiking Sock - Light CushionBest seller
4.97 (33 reviews)Women's Merino Wool Hiking Sock - Light CushionDay hikes and thru-hikes$ 23.99
Women's Merino Wool 1/4 Top Running Sock - Light CushionRunner favorite
4.98 (45 reviews)Women's Merino Wool 1/4 Top Running Sock - Light CushionTrail and road running$ 19.99
Women's Merino Wool Compression Sock - Light Cushion15 to 20 mmHg
4.67 (45 reviews)Women's Merino Wool Compression Sock - Light CushionLong days on your feet$ 27.99
  • 5 stars: 39 (98%)
  • 4 stars: 1 (3%)
  • 3 stars: 0 (0%)
  • 2 stars: 0 (0%)
  • 1 star: 0 (0%)
T
Theresa K.
Tight for me

I've learned that the thicker socks work better for me.

T
Tabatha R.
Awesome

Awesome socks!! They wear very well!

D
Deanna O.
Sock heaven

This sock is warm, comfortable and can be worn with any shoe. Though perfect for hiking, it's my go to sock for everyday use.

B
Barbara K.
Perfect everyday socks

The cotton socks I was wearing with Ecco booties were leaving my feet damp and cold which led me to this purchase. The ultralight hiking sock adds no bulk inside my shoe, works well for winter walks in fitted athletic shoes and all casual shoes. They do fit snuggly, but stay in place. So smooth with no seam bumps. They keep my feet warm and dry.

R
Renae M.
Awesome hiking sock

I wore this sock for a 6 mile 70 degree hike. It kept my feel cool and dry for the hike and no blisters. I will be buying more!

L
Lucy G.
Perfect for hiking

Wore these several years ago on a big 10 day hike and they were perfect. Just bought some more for the next big hike. Warm and comfy without too much bulk in my hiking boot.

K
Kathy B.
Perfect for cross country skiing

Fits good in xc ski boot which takes more to a thinner sock than a bulkier hiking sock. I only wear Cloudline socks. I have tried others but none compare to the feel and quality.

C
Colin B.
These were a Valentine's day

These were a Valentine's day gift for my girlfriend....... She was very happy with them, I think that should say it all, excellent socks

J
Jessie M.
Ultralight hiking sock

Fantastic! Perfect fit and function

R
Rebecca C.
Great Sock!

Husband loves the socks. He wears these in preference to other wool socks he has. These are a hit!

D
Deanna O.
Perfect socks

Lightweight, feel good and fit perfectly in my hiking boots. Soft, cushiony and all the good things you want in a sock without the bulk.

D
Debra M.
Great fit!

I have a small foot - US shoe size 4 1/2 and socks are always too big and the toe part bunches in the front of my shoe and is very uncomfortable. The small size is just perfect for my foot and hiking boot. I was concerned about wool socks in the summer by they are very comfortable and soft. Love these socks.

S
Sarah R.
Very comfy lightweight hiking socks!

Very comfy lightweight hiking socks!

K
Kate M.
Amazing

Great weight, nice and cool, and an excellent value- my new favorite socks!

P
Pamela W.
Perfect

Socks fit extremely well. comfortable. Tune in later for wearability.

E
Eileen H.
My go-to hiking sock

I’ve been searching for lightweight socks such as these. My feet tend to get hot with thicker, so-called lightweight hiking socks. These are thin but cradle my foot with a great fit and not too much bulk. Definite thumbs up!

L
Lauren H.
Great socks, even greater company

These socks are great for hiking. I'm in the western CO Rockies, so my recent hikes have been snowy/slushy (early March). These have kept me warm enough when it's cool, without overheating and making my feet sweat. Gross.
When I purchased these hiking socks and the retro compression socks online, I made a mistake with my shipping info. Austin reached out immediately and fixed the problem, and then some! .....even though it was entirely my fault. Stellar customer service. I will absolutely be back for more socks! Who doesn't love socks?!

T
Tabatha R.
Comfortable

Love these socks!

S
Seth H.
Soft and comfortable

Soft and comfortable

D
Deirdrea G.
Yeah ultra light

Best hiking sock ever. I use the ultra light because I wear a toe sock liner underneath. Very hard to find ultra light hiking socks.

M
Michelle P.
Awesome

Very comfortable and lightweight socks.

S
Stefanie H.
Great hiking sock

Perfect sock for hiking, even in warmer temperatures!

T
Todd W.
Awesome

Awesome

R
Ronda H.
Right purchase

I shopped for a while, wanting a high content of merino wool. These socks gave me everything I was looking for. Softness, style, and great performance. I will order again.

B
Becca W.
Ultra light hiking socks

These socks are great for warm weather hikes in NC, they offer the right amount of moisture wicking and temperature control to keep you comfortable on the trail. Definitely recommend!

L
Lindsay B.
Wary at first, but after a few wears, love them

When I first received these, I didn't like how boxy the toe looked. The seams seemed to stick out more than you'd expect on the toe and heel, and seemed stiff. I was worried they'd rub while hiking. Since wearing them 10-15 times now, the seams have relaxed and now feel and look like any other well made sock.

Apart from the seam concern, I love the ultra light sock. It is the perfect weight and warmth for summer hikes. I also very much like the gray with subtle colors. I am very happy with these socks and will likely buy more.

J
Judith
Great socks

My daughter used these on our hike in the Amazon rainforest and she said they were perfect!

M
Missy
Favorite sock!

I ordered 1 pair to try out and loved them so much I ordered more! These socks are so comfortable and stay put!

L
Loralee N.
Great socks.

Great socks.

S
Sherrie H.
The PERFECT Sock!

I have several (8) pair of Cloudline socks - mainly medium cushion hikers. Got these for use with some tighter-fitting hiking boots and so far, I'm really pleased. I get the cushion of the hiking sock with less bulk around the ankle and calf. Fantastic socks and EXTRAORDINARY customer service!

P
Patricia M.
Yeah sweet

Light weight thin and comfort. A little thinner then I thought they would be but happy with them. They performance was top notch!

J
Jacinda F.
My new favorite

These socks perform like nobody's business. They've become my go-to pair whether I'm hitting the trail or putting in a long day on the shop floor. The best thing about these socks is the design! There are no uncomfortable seams to wear on your toes. In the backcountry I have found them to be lightweight, warm, and excellent at resisting that "crusty, stanky" phenomenon that sets in after a few hard days. Basically amazing.

K
Karen B.
Great Priduct

Great Priduct

Out there in #cloudlinesocks

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