Men's Alpaca Wool Base Layer Half-Zip

300 Lightweight

$175.00
4.9Rated 4.9 out of 5 41 reviews

Warm up without stopping to change. This men's 300 g/m² Alpaca base layer has a half zip for ventilation on the climb and a fitted cut for layering when you reach the ridge.

Low Impact Dyes

Baby Blue

Natural Dyes

Why natural?
Size: SSize guide

This size is currently out of stock. Get notified when it's back.

Free US shipping on orders over $200.

Return unused, unwashed items within 15 days of delivery. Return fees may apply.

Zip up for the start. Open up on the climb.

Your layer starts with Alpaca wool from Peru. Its smooth fiber surface gives the knit a soft feel, while the knit structure allows air to move through as you do.

Product info

  • Adjust without changing layers

    The half zip lets you open the neckline as your effort increases, then close it when you stop.

  • Warmth in the knit

    The knit holds air close to your body for insulation, while its open structure allows air to move through as your effort changes.

Perfect for

  • Outdoor activities
  • Backpacking
  • Cold-weather travel

Product details

What goes into your layer
  • Fabric100% Alpaca wool
  • Thread100% cotton
  • Labels100% organic cotton
  • DyesNatural or OEKO-TEX certified, depending on the color. Undyed colors have no added dye.
  • Label inkGOTS certified
  • ClosureHalf zip

Specifications

  • Fabric weight300 g/m²
  • Weight356 g / 12.6 oz in size M
  • ConstructionLong-sleeve base layer with a half-zip neckline
  • FitFitted cut with natural stretch
  • Made inPeru
Size & fit

Use your body measurements to choose your size. These are body ranges, not flat garment measurements.

SizeChestWaist
S35 - 38 in28 - 31 in
M38 - 40.5 in31 - 34 in
L40.5 - 43 in34 - 36.5 in
XL43 - 46 in36.5 - 39.5 in
XXL46 - 49 in39.5 - 42 in
SizeChestWaist
S89 - 96 cm72 - 79 cm
M96 - 103 cm79 - 86 cm
L103 - 110 cm86 - 93 cm
XL110 - 117 cm93 - 100 cm
XXL117 - 124 cm100 - 107 cm
Care for your layer

Hand wash or machine wash on a gentle/wool cycle in cold water (50-68°F). Use a mild wool-safe or pH-neutral detergent. Wash with similar colors. Don't bleach or use fabric softener.

Reshape while damp and lay flat to dry. Don't tumble dry, twist, or wring. Cool iron if needed. Store folded in a cool, dry space with airflow; avoid hanging.

Naturally dyed colors can transfer with sweat or friction. Wear them with dark clothing or equipment, wash sparingly, and avoid citric acid, which can lighten the color.

Shipping & Returns

US orders over $200 ship free. Estimated US delivery is 7 to 10 business days, including preparation and transit. You'll receive a tracking number by email once your order ships. International rates are calculated at checkout; estimated delivery is 10 to 20 business days. Customs duties and import taxes are your responsibility.

Eligible unused, unwashed items may be returned within 15 days of delivery. What counts is that you start your request within those 15 days; how long the package then takes to reach us does not affect your refund. Original packaging isn't required. A $5 domestic return shipping fee applies unless Free Returns was purchased at checkout. International return shipping is paid by the customer, except for wrong or defective items under the policy.

Men's Alpaca Wool Base Layer: 300 Lightweight Half-Zip

The benefits

Why Alpaca wins

Alpacas en los Andes peruanos

Andes-adapted for changing temperatures

Alpacas evolved where days run warm and nights turn cold. Their semi-hollow fibers trap insulating air, helping you stay comfortable as the temperature changes.

Softness starts in the fiber

Alpaca’s smoother scales give the fabric a soft feel against your skin. Comfort comes from the fiber’s structure.

Wear more, wash less

Alpaca wool naturally resists odor. Air your layer between wears, then wash it when it needs cleaning. Less time doing laundry. More time outside.

Single origin

Peru, start to finish.

Arms of Andes is a family company with roots in the Peruvian Andes. “Arms” brings together the initials of four siblings. That connection to Peru shapes what we make and where we make it.

From fiber sourcing and yarn spinning to knitting and sewing, production stays in Peru. One country, with the people and knowledge behind your gear close together.

Learn our story

Customer reviews

  • 5 stars: 39 (95%)
  • 4 stars: 1 (2%)
  • 3 stars: 1 (2%)
  • 2 stars: 0 (0%)
  • 1 star: 0 (0%)
D
Derick
Fantastic base layer, stays warm and dry all day no problem.

The 300 gsm half zip base layer worked perfectly in the Canadian mountains. It stayed warm, didn't get heavy with sweat, and dried out odor free overnight ready for the next day. Time will tell how it holds up, but my other Arms of Andes pieces have all proven durable enough, so I have no reason to expect this will be any different. Great stuff!

Hi Derick! Thank you so much for sharing your experience! We’re glad to hear the 300 gsm half zip base layer performed well in the Canadian mountains. It’s great to know it was ready for the next day, too. We truly appreciate your support and feedback!

A
Anonymous
300 weight half-zip

Very warm and it fits well

A
Anonymous
Scratchy Seams

The actual alpaca material is very soft and warm. The thread used to stitch it together is very scratchy even after washing. I can’t wear it against my skin.

A
Anonymous
A++

Bought for my son for Christmas. It was a huge hit, base later that looks nice off the slopes!

A
Anonymous
Great shirt - not just a base layer!

Really great shirt. Not itchy at all and seems to temperature regulate. Also classy enough to wear around town as a regular shirt. Highly recommended!

J
Jeff Myers
Simply Amazing

Love my new top. Good fit and exceptional comfort. This was my first purchase and certainly not my last. Great for travel or everyday use.

H
HOLLAND WILLIAMS
300 weight half zip

I just bought this last month and we're heading into warmer weather so I've only worn it once. It's very warm and fits well so I think it will be great next fall and winter. I've always worn wool (scratchy whatever before merino). This is really soft and should be warmer than my 300 weight merino. I'm enjoying spring right now, but will be looking forward to winter after July. I can't attest to the longevity; that will have to wait until this time next year.

Hi Holland! Thanks so much for the thoughtful note! We're glad to hear it fits well and feels soft, alpaca really is something special. Enjoy the spring sunshine, and we’ll be here when you’re ready for winter again!

P
Patrick from Banff Canada
Wow. Great Product is the 300 Weight Long Sleeve Half Zip

Just finished skiing with my beautiful base layer in Fernie British Columbia & Mammoth California where temps were -12c to -5c. Product is quality made that keeps me warm and breathes respectably.
This product is of great value- I’m buying more product from this family company before they get main stream….,,and bang ‼️ they will be more $.
Fits as represented large for my 43/43.5 inch chest.

Hi Patrick,
Thank you so much for your feedback! We're so glad to hear that your 300 Weight base layer kept you warm and comfortable during your skiing adventures in Fernie and Mammoth those are some chilly temps!
It means a lot to us that you appreciate the quality and value of our products, and we're honored to be part of your gear lineup. We’re also grateful for your support as a family run company it’s customers like you who help us grow while staying true to our roots.

w
william hohl
Very effective after sweating

I wish I’d found this stuff sooner! Now I’m not freezing when biking back down the mountain

Hi William,
We're so glad our gear is keeping you warm on your rides! Better late than never, right? Wishing you many more comfortable mountain adventures.

T
Theresa T.
Worthy buy

I bought one for my significant other because he's always cold now and normally has to wear several layers. He wore it a few times and didn't need as many layers. He asked about the cost because he is interested in getting more. As far as I'm concerned, it's worth it!

Hi Theresa,

What a thoughtful gift! We're so glad to hear the warmth made a difference for him. Investing in quality layers can really be a game changer. Thanks for sharing your experience!

k
kevin brodar
Alpaca layer

I was surprised how soft it was. It work as advertised !! Very good at wicking and warmth. Fit is as noted. No binding or pinching. Would highly recommend!

Hi Kevin,

We're so glad to hear you're enjoying your alpaca garment! It's great to know it's keeping you warm and comfortable while wicking moisture as expected. Thanks for your recommendation!

G
George Drew

Excellent in every way. I will definitely be a lifelong customer

Hi George,

Thank you so much for your kind words! We’re thrilled to hear you’re happy with your purchase. It's customers like you that make all the hard work worth it. We’re excited to have you as a lifelong customer!

We look forward to providing you with more great products in the future!

S
Scott W
Very Nice Base Layer Shirt

I use this shirt as an intermediate layer while winter fishing and this has exceeded every expectation. Having this shirt as 100% Alpaca versus a small percentage is a big bonus. Given the quality, I’ll be looking at additional clothing.

Hi Scott,

Thanks for your great feedback! We’re glad to hear the base layer shirt is exceeding your expectations. Feel free to explore our full catalog for more high-quality gear – we’re excited to keep providing you with the best products!

A
Al Breeding
Nice piece

The 300 quarter zip is a nice addition to my layering system. Lightweight and warm.

We're so glad the 300 quarter zip is working well for your layering system! It's great to hear it's lightweight yet warm, perfect for those colder days!

E
Eric P
So soft and so warm

So glad I decided on this for my first alpaca sweater. It is extremely warm. This shirt and a fleece were almost too much for a 40 degree day. I wear it for casual wear not for outdoor activities. I wear it as a baselayer and it does not itch. It is soft but not like a fleece or cotton obviously. The fit is good. (XL) I am 5’10”, 210lbs, 44R. It is form fitting in the chest, plenty of room in the shoulders. The sleeves are long, like a shirt with thumb holes but there are no holes.

Hi Eric,

We're so glad you chose this as your first alpaca sweater! Alpaca wool is naturally warm and breathable, making it perfect for layering without overheating. It’s designed for comfort, with a soft feel and a great fit. Thanks for sharing your experience—we're happy to hear you're enjoying it!

B
Brent Rivers
Alpaca is My New Love

I've been in the process of removing synthetic fibers from my life and have been a merino wool wearer for a long time. In more recent time I've picked up a few alpaca items and I have to say, I love it more than merino wool! I started with one hoodie and added a qtr zip and another half zip hoodie. I rotate these three and my wife says I just need to get more colors ;)

P
Patricia
Perfect

I bought this for my husband for Christmas. It is perfect, he absolutely loves it and I think he has wore it every single day since we recieved it. It took a while to ship with the holidays, but I just ordered a second one for myself! It is so soft and buttery, I can not wait to wear it. I tried my husbands on and I did t want to take it off either!

Hi Patricia! Thank you so much for sharing! We're thrilled to hear that both you and your husband love the item. It's wonderful to know it's become a daily favorite! We hope you enjoy your second one just as much!

C
Christopher Dostie
Warm!

I use this hiking/backpacking along with an alpaca hoodie. My jacket is an Outdoor Vitals Down Jacket. To backpack, I've found that just using this zip-up is all you need and store the hoodie. Also, I have pit zips on my jacket and must open them. This zip-up is super warm when sitting around the campsite in winter, 20 degrees when layered with a hoodie and jacket. It does have a little bit of a wool itch feel, but after wearing it more, it seems to subside. I also appreciate it zipping further down so you can regulate your temperature.

J
JEFFREY OFMAN
Light weight top

Love the top super soft feel and keeps you warm. I wear for hunting and like the fit not bulky

Hi Jeffrey!
Thank you for your feedback! We’re so glad to hear you love the lightweight top. It’s great to know the fit works well without feeling bulky, just what we aim for!

If you ever need anything else, feel free to reach out. We appreciate your support and look forward to serving you again!

C
Chris D.
I’m breaking up with cotton

Alpaca is my new fabric of choice. Love the base layer and thank you for sending it along so quickly. I also love your mission and commitment supporting both the environment and people of Peru. Please consider adding three back pockets to the base layer to create a cycling jersey.

Hi Chris, Thank you for such a thoughtful and enthusiastic review! We’re thrilled to hear that alpaca has won you over and that you’re loving your base layer. It’s wonderful to know you appreciate our mission and commitment to supporting the environment and the people of Peru, it truly means a lot to us.

Your idea of adding three back pockets to create a cycling jersey is fantastic! We’ll definitely pass your suggestion along to our product development team for consideration.

If you have any other ideas or need assistance, don’t hesitate to reach out. We’re here to help and look forward to serving you again!

R
Richard Cole
Great products

Purchased the warmest alpaca top mainly for sitting at winter football matches ( directly facing cold winds from the North Sea).

Very pleased with the warmth, quality and style. The length is also excellent for keeping the midriff warm and tucking securely in trousers.

I am wearing it most of the time. A plaudit on its own.

The company are small, ethical, reliable and look after their customers.

The overall costs to the UK are higher than local options. However, I still selected Arms of Andes. I have reordered a number of their products.

Hi Richard! Thank you so much for your kind words and continued support! We're thrilled to hear that the alpaca top is keeping you warm at those chilly football matches and to know you're pleased with the quality, style, and fit. We’re also very happy to hear you’re enjoying it so much you wear it most of the time, that’s definitely a plaudit in itself!

We truly appreciate your support of our company, and we’re always here to look after our customers. We're honored that you chose Arms of Andes and continue to reorder from us. Thank you again!

T
Thomas A. Ewart
Men's Alpaca Wool Base Layer: 300 Lightweight Half-Zip

Beautiful garment. Loved the fit (L). Well tailored and warm. Missing a star as I found it itchy against the skin. Not too much of n issue for me, as I don't wear as a base layer, but would find it uncomfortable if I did. If Arms of Andes addresses this one concern, I'll happily order another-

M
M.C.
Great quality, soft and odorless

It's quickly become my favorite piece of clothing. Even wearing this without an additional layer has proven quite effective in some of the warmer winter days, but as a base layer it's been a really effective workhorse. Great quality, very soft, and as best I can tell all that's advertised about odor resistance is definitely true.

Important (?) Note: The first time I wore this it felt fairly itchy. They advertise as itch free so I was concerned, as I've heard some people have bad reactions to 100% wool. However, it seems it was just a "new garment" problem. After wearing it out on a run, whatever itch I felt went away completely and now only the softness remains. I haven't read anyone else mention anything like it, but if you've never worn 100% wool before I figured I'd share my experience with it. I'm really glad I forced myself to give it a try.

J
James Rosen
luxurious

This is a handsome, warm, and luxurious top. Besides the expected property of alpaca, I am impressed with how comfortable and lush the top feels. The neck is a close fit, no gaps - at least for my neck size - which makes it comfortable and warm. Although not recommended by Arms of Andes, I laundered mine in warm water and tumble dry low. - no problem. no shrinkage, no bleeding of color. Laundered twice so far and it fits and feels the same as new.

E
Edmund Reid
ANDES SHIRT

GREAR GEAR Eddie Reid one of the best pice of clothing I have ever bought at 85 years old bow hunter I have had a lot of gear the only problem was it itched I would half to where Marino wool under your shirt I hunted 7 days in a tree stand and my UPPER body was never cold at 23 ton 30n degrees you guys hav a great product thank you EDDIE REID

C
C.H.
Great, but not quite what I expected

This is a gorgeous and comfortable garment! Wore it basically 4 strait days traveling with a little light hiking mixed in; worked great in all situations. Based on my experience with AoA t-shirts and other alpaca brands, I was expecting this to be a lightweight layer, but this sucker is relatively heavy! Clearly a denser and finer weave than other alpaca products. To be clear- I love it and will wear it often, but it is not a lightweight 'just in case' layer. As with all alpaca and merinos, it breathes well, stretches nicely and works in a range of temps. Also should note that the fit of all AoA garments is very, very athletic. This one more so even than the Ts. In most outdoor brands I am a gently snug large or loose XL. In this the 2XL is still snug around the midsection and very long (as expected with this large of a size). Also worth noting that the fabric is very streamlined yet soft out of the box, but I did start to notice some tiny pilling in many places right away. Still looks and feels great. Loves it so much I went back and bought the )even heavier 420) full zip jacket!