Merino Henley Base Layer

$130 $165

Men's Merino Long Sleeve Base Layer, white, front

Merino Henley Base Layer

A thin, close base layer with a fine slub. A 190 gsm jersey henley in 100% merino wool, with raglan sleeves and a three-button placket, cut slim through the body and arms and light in drape.

$130 $165

Save $35

A thin, close base layer with a fine slub. A 190 gsm jersey henley in 100% merino wool, with raglan sleeves and a three-button placket, cut slim through the body and arms and light in drape.

Customer fit: based on 536 reviews

Size guide

Our pieces follow standard US men's sizing, from S to XXL. The short answer: take the size you usually wear.

Which size to take

Order your usual size. For most men, in most of our pieces, that's the right call.
Between two sizes? Size up for an easier fit, particularly if you wear a shirt or a layer underneath.
On every product page, Find my fit next to the sizes starts from the size you usually wear, and Fit and sizing gives the model's height and the size worn in the photos.

Body measurements

These are body measurements, not garment measurements. Measure over a thin shirt and compare.

Size	Chest	Waist	Hips
S	35 to 37.5 in 89 to 95 cm	29 to 31 in 73 to 79 cm	35 to 37.5 in 89 to 95 cm
M	37.5 to 41 in 95 to 104 cm	31 to 35 in 79 to 89 cm	37.5 to 41 in 95 to 104 cm
L	41 to 44 in 104 to 112 cm	35 to 37 in 89 to 94 cm	41 to 44.5 in 104 to 113 cm
XL	44 to 47.5 in 112 to 121 cm	37 to 41 in 94 to 104 cm	44.5 to 47.5 in 113 to 121 cm
XXL	47.5 to 50 in 121 to 127 cm	41 to 42.5 in 104 to 108 cm	47.5 to 50 in 121 to 127 cm

How to measure

Chest: measure around the fullest part of your chest, just under the arms, with the tape level across your back.
Waist: measure around your natural waistline, where you would normally wear your trousers.
Hips: stand with your feet together and measure around the widest part of your hips and seat.

Keep the tape snug, not tight. And if your measurements point to two different sizes, go by your usual size and how you like a piece to fit.

Still unsure?

Write to info@casmerino.com with the piece and your usual size, and we'll help you choose. Returns are accepted within 30 days of delivery; see our refund policy.

Free USA shipping Free 30-day returns

A thin, close base layer with a fine slub. A 190 gsm jersey henley in 100% merino wool, with raglan sleeves and a three-button placket, cut slim through the body and arms and light in drape.

Buy more, save moreMix any styles

2 pieces10% off
3 pieces15% off
4+ pieces20% off

Odor resistant

Light & breathable

Fast drying

Temperature regulating

Slim fit, fits close

Close through the shoulders and body without feeling tight, with raglan sleeves that taper to the wrist. The hem lands at the hip, short enough to tuck in cleanly.

Model is 189 cm, wears L

Size guide

100% merino wool in a 190 gsm jersey. Fine fibres sit soft on bare skin, and the wool breathes through a long day.

SoftnessSuperfine, 17.5 µm

Micron is the width of one fibre. Lower is softer.

Composition: 100% merino wool
Fibre: Superfine merino wool, 17.5 micron
Knit or weave: Fine jersey
Gauge or weight: 190 gsm
Neckline or collar: Crew neck
Closure: Three-button placket
Sleeve: Long sleeve, raglan
Length: Hip length
Fit: Slim fit

Hand wash cold or machine wash on wool
Dry flat
Do not bleach
Do not tumble dry

A thin, close base layer with a fine slub. A 190 gsm jersey henley in 100% merino wool, with raglan sleeves and a three-button placket, cut slim through the body and arms and light in drape.

Composition: 100% merino wool
Fibre: Superfine merino wool, 17.5 micron
Knit or weave: Fine jersey
Gauge or weight: 190 gsm
Neckline or collar: Crew neck
Closure: Three-button placket
Sleeve: Long sleeve, raglan
Length: Hip length
Fit: Slim fit

Fibre finenessSuperfine, 17.5 µm

Micron is the width of one wool fibre. The lower the number, the softer the wool feels on skin.

“Merino made for the road. Light, breathable and fresh day after day.”

CasmerinoAustralian Merino Wool^®

Our Australian merino has fine 17.5 micron fibers that feel soft against bare skin. The Woolmark^® label vouches for its fiber content, color fastness and shape retention.
With NATIVA^™, every bale is traceable to its farm of origin, and every farm is mulesing-free.
The Responsible Wool Standard (RWS) sets clear requirements for how the sheep are cared for and how their grazing land is managed.
Each piece carries the OEKO-TEX^® STANDARD 100 label: every thread, button and trim is tested for harmful substances.

Good to know.

Quick answers before you order.

Ask us anything else

It has a slim fit. Take your usual size, and if you are between two, size up for an easier fit.

Yes. Tap Find my fit next to the sizes. It asks a few short questions, starting with the size you usually wear, and suggests a size for this piece.

The Fit and sizing section above gives the model's height and the size worn in the photos, so you can compare it with your own build.

Not with the right care. Heat and a tumble dryer are what shrink wool, so wash it cool, by hand or on a wool cycle, and dry it flat.

Send it back within 30 days and the return costs you nothing. Then order the size you want.

100% merino wool, in a 190 gsm jersey. Every detail is listed under Fabric and details above.

Itch comes from coarse fibers. Merino is much finer than ordinary wool, so it feels soft on bare skin. This one is 17.5 microns.

Any natural knit can pill a little where it rubs, under the arms or along the sides, mostly in the first weeks. A sweater comb lifts it off in a minute.

Less often than you think: merino resists odor, so airing it between wears is often enough. When it does need a wash, go cool, by hand or on a wool cycle, and lay it flat to dry in the shade. No bleach, no tumble dryer.

Fold it rather than hang it, so the shoulders keep their shape. Store it clean in a drawer or a breathable bag, with a little cedar if moths are a worry.

Nothing inside the USA. Every US order ships free.

No. A single piece ships free inside the USA, the same as a larger order.

We email you a tracking link as soon as your order ships. It shows where your parcel is and when the carrier expects to deliver it.

Yes, to many countries. Free shipping applies to US orders. For other countries, the delivery cost is shown at checkout before you pay.

Yes, as long as the order has not shipped yet. Write to us with your order number and the new address, and we update it before it leaves.

Try it on at home and decide there. If it is not right, send it back within 30 days and the return costs you nothing.

Write to us with your order number. We reply with everything you need to send it back, at no cost to you.

Yes. Send the piece back within 30 days, free, and order the size or color you want.

Once your return reaches us, we refund it to the payment method you used, and you get an email when it is done.

Yes. Free US shipping and free 30-day returns come with every order, sale prices included.

Mix any styles. Two pieces take 10% off your order, three take 15%, and four or more take 20%. It applies automatically at checkout, no code needed.

All prices are in US dollars. Any sales tax is calculated at checkout, before you pay.

Yes. Checkout is fully encrypted, and we never see or store your full card details. The payment options open to you are shown there.

Write to us as soon as you can with your order number. If it has not shipped yet, we change or cancel it for you.

Yes. A confirmation email arrives right after you order, and a second one with your tracking link follows once it ships.

Ask us anything else

What people are saying

4.8

Based on 536 reviews

5 star 457
4 star 71
3 star 5
2 star 3
1 star 0

How did you find the fit?

Runs smallTrue to sizeRuns big

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W

Walter G.

9/30/26

5 Stars

I chose a medium as I run slim. It packed beautifully for my trip to Boston.

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J

Justin B.

9/29/26

Washes great

Packed this on three trips now and it washes fine every time, no shrinking or losing its shape.

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L

Larry S.

9/29/26

5 Stars

Wear this on cold mornnig walks with the dog and it just feels right, soft and warm the whole time. My brother even asked where I got it after seeing me in it twice.

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M

Mary G.

9/29/26

5 Stars

My husband loves it. Sleeves hit right at the wrist and the length is perfect for tucking in.

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M

Mateo H.

9/28/26

does the job

Wear this under a coat most days now. Light enough that it does not add bulk, warm enough that I do not need much else underneath. Also fine on its own with a tee over it on milder days. No complaints. Does what it is supposed to do, which is more than I can say for a lot of things I have bought lately.