Engel · Merino Wool & Silk Thermal Base Layer
Men's Long Sleeve Wool Base Layer Shirt - 70% Organic Merino Wool, 30% Silk
A lightweight 190 gsm thermal undershirt knit in Germany from fine merino wool and mulberry silk. Soft against skin, naturally temperature-regulating, and built to layer under everything from a button-down to a ski shell.
About the brand
Engel - German natural fiber craftsmanship since 1927
Engel has been knitting wool and silk garments in southern Germany for nearly a century. The company is one of the most respected European natural fiber labels and works exclusively with certified organic raw materials, vertically integrated production, and IVN BEST certified manufacturing - the strictest natural textile standard in the world. When you buy an Engel piece, you're buying a garment from a maker that has refined this exact category for generations.
This men's long sleeve base layer is one of Engel's signature year-round pieces, designed for the wearer who wants real merino-silk performance without the bulk of a heavy thermal.
When to wear it
Year-round layering, fall through spring
At 190 gsm, this shirt sits in the lightweight base layer category - thin enough to wear under a dress shirt or sweater without adding visible bulk, and warm enough to serve as a true cold-weather thermal under a ski jacket or winter coat. The merino wool and silk blend regulates temperature actively, which means it keeps you warm when it's cold and dumps heat when you warm up. That's why merino base layers stay comfortable through stop-and-go activities like skiing, hiking, or long travel days where ambient temperature shifts.
- Winter: First layer under a sweater, button-down, or insulated outerwear
- Shoulder seasons: Standalone long sleeve shirt for cool mornings and crisp evenings
- Travel and outdoor activity: Skiing, hiking, long-haul flights, weekend trips
- Sleep: Comfortable as a sleep shirt in unheated rooms or cold cabins
Materials & construction
70% organic merino wool, 30% mulberry silk - 190 gsm fine rib knit
The fabric is a 190 gsm fine rib knit, which gives the shirt its slight stretch, close-to-body fit, and ability to layer cleanly under other clothing. The merino is fine-micron, which is what makes it soft enough to wear directly against skin without scratch. The silk content - a meaningful 30% - softens the hand further and adds a subtle sheen typical of high-end wool-silk thermals.
70% Organic Merino Wool
Fine-micron merino, kbT certified (kontrolliert biologische Tierhaltung - certified organic livestock farming with strict animal welfare standards). Naturally temperature-regulating, moisture-wicking, and odor-resistant.
30% Mulberry Silk
Adds softness, drape, and a subtle sheen. Silk is the reason wool-silk blends are recommended as a first wool layer for sensitive skin - it makes the fabric noticeably gentler against the body.
190 gsm Fabric Weight
Lightweight thermal weight - thin enough to layer invisibly under shirts and sweaters, warm enough for true cold-weather use as a base. Fine rib knit construction provides comfortable stretch.
Made in Germany
Knit, sewn, and finished in Germany by Engel. IVN BEST certified - the most stringent worldwide standard for natural textiles, covering organic farming, processing, dyes, and finishing.
What does IVN BEST certified mean?
IVN BEST is the strictest natural textile certification in the world. It goes beyond GOTS - requiring 100% certified organic natural fibers (no synthetic blends), more restrictive chemical limits, and stricter social standards. If you're researching the highest tier of certified organic wool clothing, IVN BEST is it.
Key features
Why men buy this base layer
W
Warmth without bulk
190 gsm sits in the thin-and-warm sweet spot - measurably warmer than a cotton tee, but slim enough to disappear under a slim-cut dress shirt or sweater.
T
Temperature-regulating
Merino actively regulates body temperature, keeping you warm in cold weather and cool when you warm up. This is why one shirt can work across multiple seasons and activity levels.
O
Odor-resistant
Merino wool is naturally bacteria-resistant and odor-resistant. You can wear this shirt multiple times between washes - just air it out overnight. Travelers love this.
S
Soft against skin
The 70/30 wool-silk blend is one of the softest natural fiber base layer constructions available. The silk content makes a real difference if you've found pure wool itchy in the past.
M
Moisture-wicking
Merino can absorb up to 30% of its weight in moisture without feeling damp - it pulls sweat away from your skin and releases it through evaporation, unlike synthetics that trap odor and moisture against the body.
C
IVN BEST certified
The highest tier of certified organic wool clothing. No synthetic blends, no chemical finishes, no compromises - just wool, silk, and German craftsmanship.
Sizing
Three sizes - EU sizing runs slim
Engel uses European men's sizing. If you're at the upper end of a chest measurement or prefer a relaxed rather than close-to-body fit, size up. The fine rib knit has natural stretch, so a snug fit is comfortable - this shirt is designed to layer.
| Size |
EU |
Equivalent US |
Best for chest |
| Small |
EU 46-48 |
US S |
Chest 36-38 in / 92-97 cm |
| Medium |
EU 50-52 |
US M |
Chest 39-41 in / 99-104 cm |
| Large |
EU 54-56 |
US L |
Chest 42-44 in / 107-112 cm |
Sizing tip
European sizing runs slightly slim by US standards. If you're between sizes, prefer a relaxed fit, or plan to wear this over another shirt rather than as a true base layer, size up. If you want it to function as a close-fitting thermal under outerwear, your normal size is correct.
Honest assessment
Who this shirt is right for - and who it isn't
Works well for
Men who want a real natural-fiber base layer that performs across seasons. Travelers who want a shirt they can wear multiple days between washes. Anyone with sensitive skin who has reacted to synthetic thermals or coarse wool - the silk content makes this one of the gentlest wool layers on the market. Skiers, hikers, and anyone whose activity involves shifting temperatures.
Trade-offs to know
This is a heritage European piece at heritage European prices. It's hand-wash only and air-dry only - if you tumble dry it, it will felt and shrink, and that damage is permanent. A small percentage of people remain sensitive to even fine merino wool; if you've never worn wool against skin before, expect a brief adjustment period. The fit is European-slim by design.
The care commitment
This shirt rewards proper care with years of wear. Hand wash or machine wool cycle in cold water, wool-specific detergent, lay flat to dry. That's the whole routine. Once you've done it twice, it's faster than you'd think - and merino's odor resistance means you'll do it far less often than you would with a synthetic or cotton shirt.
Care instructions
Wool care - simple once you know it
Hand wash or wool cycle Cold water only Wool-specific detergent Lay flat to dry No tumble dry No bleach or fabric softener
Hand wash in cold water with a wool-specific detergent (such as Eucalan or Sonett wool wash), or use the wool/delicate cycle on your machine with cold water only. Press water out gently - never wring or twist. Lay flat on a clean towel to reshape, then air dry away from direct heat or sunlight. Wool naturally resists odor and rarely needs frequent washing - airing between wears is often enough. With proper care, this shirt will last for years.
Important: never tumble dry wool
If wool is exposed to hot water, agitation, or tumble drying, the fibers felt together and shrink. This damage is permanent. Cold water, gentle handling, and lay-flat drying are the whole care routine - do them and the shirt will outlast most of your other clothes.
FAQ
Common questions
Is this merino wool itchy?
No, for the vast majority of wearers. The merino used in Engel base layers is fine-micron wool (typically 17-19 microns), which is meaningfully different from coarse wool. The 30% silk content softens the fabric further. Wool-silk blends like this one are the recommended starting point for anyone who has found wool itchy in the past. A small percentage of people are still sensitive to wool - if that's you, the silk blend gives you the best chance of comfort.
What does 190 gsm mean and how warm is it?
GSM stands for grams per square meter - a standard measure of fabric weight. At 190 gsm, this shirt sits in the lightweight base layer category. It's measurably warmer than a typical cotton tee but thin enough to layer cleanly under shirts and sweaters. It's the right weight for a true four-season base layer. For deep winter, you'd add insulating layers on top of it rather than choosing a heavier shirt.
Can I machine wash this shirt?
Only on a wool or delicate cycle, with cold water and a wool-specific detergent. Hand washing is gentlest and recommended. Never use a regular cycle, hot water, or tumble dryer - any of these will felt and shrink the wool permanently.
How often does this shirt need washing?
Far less often than a cotton or synthetic shirt. Merino wool is naturally odor-resistant and bacteria-resistant - airing it out overnight refreshes it between wears. Many wearers go a week or more between washes with regular daily use. This is one of the reasons merino base layers are popular with travelers.
What's the difference between this and the extended-back version?
Engel makes two versions of this shirt. This standard long sleeve has a regular hem. The extended-back version has a slightly longer back hem, which keeps the shirt tucked when you bend, stretch, or move actively. Choose the extended back if you want extra coverage during active wear; choose this standard cut for everyday layering.
Where is this shirt made?
Knit, sewn, and finished in Germany by Engel, a family-run natural fiber maker since 1927. The fabric is IVN BEST certified, the strictest organic textile standard in the world.
What size should I order?
Engel uses European sizing, which runs slightly slim by US standards. Use the size chart above to match your chest measurement. If you're between sizes, prefer a relaxed fit, or plan to wear this loosely rather than as a close base layer, size up.
