Engel · Men's Merino Wool & Silk Base Layer
Engel Men's Thermal Long Johns — 70% Organic Merino Wool, 30% Silk
A fine-rib 190 gsm wool/silk legging from Engel, the German heritage brand making natural-fiber base layers since 1927. Soft enough to sleep in, warm enough to layer under ski pants, and made entirely in Germany from IVN BEST certified organic fibers.
About Engel
Made in Germany since 1927
Engel is one of Germany's most respected natural-fiber clothing makers, family-run for nearly a century in the small town of Schorndorf. The brand specializes in untreated organic merino wool and wool/silk pieces, with every garment knit, finished, and sewn at their own facility. The wool comes from kbT-certified organic sheep — animals raised under strict welfare standards on pesticide-free pasture — and the dyes are heavy-metal free and AZO-free. If you've worn Engel before, you know the fit and the feel; if this is your first piece, expect a soft, fine-rib knit that's clearly different from anything mass-produced.
When to wear them
A four-season base layer that punches above its weight
At 190 gsm, these long johns sit in the lightweight-to-mid-weight range — thin enough to wear comfortably under jeans or trousers without bulk, warm enough to handle genuine cold once a heavier outer layer is added. Most men wear them three ways: as a thermal base layer under pants for skiing, hiking, hunting, ice fishing, or winter commuting; as pajama bottoms for cold bedrooms (wool-silk regulates temperature so you don't wake up sweating); and as around-the-house loungewear when the heating is turned down. The wool-silk blend works year-round — wool keeps you warm when it's cold and surprisingly cool when it's not, because it actively wicks moisture away from skin instead of trapping it like synthetic thermals.
Quick fit for the natural-fiber researcher
Fine 19.5-micron merino blended with mulberry silk · 190 gsm fine-rib knit · IVN BEST certified · Made in Germany · GOTS organic · Hand wash or wool cycle.
Materials & construction
What's actually in this fabric
70% Organic Merino Wool
Fine 19.5-micron merino — well below the 22-micron threshold most wearers consider next-to-skin comfortable. Sourced from kbT-certified organic flocks (kontrolliert biologische Tierhaltung), meaning the sheep are raised under verified organic livestock standards with no mulesing, no pesticide dips, and pasture-based grazing.
30% Mulberry Silk
Long-staple cultivated silk that softens the hand of the fabric, adds a slight sheen, and reduces any wool prickle for sensitive skin. Silk is the reason these feel smoother than 100% merino at the same weight.
190 gsm fine-rib knit
A fine-gauge ribbed knit weighing approximately 190 grams per square meter. Light enough to layer under regular trousers without bunching, structured enough to hold its shape and stretch with you. Naturally elastic — no spandex.
IVN BEST & GOTS certified
IVN BEST is the strictest natural-textile standard in the world — stricter than GOTS — covering the entire production chain from fiber to finished garment, with no chemical finishing permitted. These long johns also meet GOTS (Global Organic Textile Standard).
Made in Germany
Knit, dyed, and sewn at Engel's own facility in Schorndorf, Baden-Württemberg. No outsourcing, no mystery supply chain.
Reinforced gusset & cuffs
A reinforced front gusset adds support and durability through the crotch — the place wool/silk leggings most often fail. Snug knit cuffs at the ankles keep the legs from riding up under pants or boots.
Why merino wool & silk
What this fabric does that synthetics can't
◐
Temperature regulating
Merino actively responds to body heat and humidity — warm when you're cold, cool when you're working hard. Synthetic thermals only insulate; they don't regulate.
≈
Moisture wicking
Wool fibers can absorb up to 30% of their weight in moisture without feeling wet, then release it back to the air. You stay dry instead of clammy.
○
Naturally odor-resistant
Wool's natural structure resists the bacteria that cause odor — these can be worn for several days of activity and aired between wears instead of washed after every use.
↔
Stretchy & second-skin
The fine-rib construction stretches in every direction without spandex. Sits close to the body without compressing, layers cleanly under any pants.
✦
No chemical finishing
No anti-pill coatings, no flame retardants, no superwash chlorine treatment. The wool is exactly what it sounds like — wool.
∞
Built to last years
Cared for properly, Engel pieces commonly last a decade or more of regular wear. The price-per-wear math becomes very different from disposable thermals.
Sizing
Size chart — European sizing
Engel uses European numeric sizing. The fabric is very stretchy and accommodates most body types easily within a size range. European cuts run slightly slim — if you're at the upper end of a waist range or have a longer inseam, size up.
| Size (EU) |
US equivalent |
Waist (in) |
Length (cm) |
Inseam (cm) |
| EU 46/48 |
S |
30–32" |
104 |
77 |
| EU 50/52 |
M |
33–35" |
106 |
79 |
| EU 54/56 |
L |
36–39" |
112 |
81 |
Measurements taken with garment lying flat. The natural elasticity of the wool/silk knit allows for more give than the flat measurement suggests.
Honest assessment
Who these work well for — and what to know going in
Best for
Men who want a genuinely versatile natural-fiber base layer — one piece that works for skiing, sleeping, lounging, and travel. Especially good for anyone who runs hot in synthetic thermals and ends up sweaty, or whose skin reacts to polyester and polypropylene. The silk content makes these the gentlest entry point into wool base layers if you've previously found pure merino too prickly.
Trade-offs to know
These are heritage-priced. They're not a $30 thermal — but they also aren't competing with $30 thermals. For deep-cold mountaineering or extended cold-weather hunting, you may want a heavier weight (250+ gsm) merino as a primary layer. The 190 gsm here is a true everyday and active layer, not an extreme expedition weight.
Care commitment
Wool and silk require gentler care than cotton — hand wash or wool cycle, no tumble dry. The good news: wool's natural odor resistance means you'll wash these far less often than synthetic thermals. Most owners wash them every few weeks at most, just airing them between wears.
Care instructions
How to wash wool/silk without ruining it
Hand wash or wool cycle Cold water (max 30°C / 86°F) pH-neutral wool wash Lay flat to dry No tumble drying No fabric softener
Hand wash in cold water with a wool-specific detergent such as Eucalan, Sonett, or Disana wool wash. If you prefer to use the machine, choose the wool or hand-wash cycle, set the temperature to cold or 30°C maximum, and reduce the spin speed to 400–500 rpm. Press water out gently — never wring. Lay flat on a towel to reshape and air dry away from direct heat or sunlight.
Wool naturally regenerates between wears in fresh air, so you'll wash these much less often than cotton or synthetic thermals. Airing them overnight is often enough. Avoid fabric softeners entirely — they coat wool fibers and reduce both breathability and the natural odor resistance.
If you're new to washing wool
Hot water plus agitation plus rapid temperature changes is what causes wool to felt and shrink. Cold-only, gentle, and slow is the rule. Once you've done it a couple of times it becomes routine.
Frequently asked questions
Common questions
Will these be itchy?
At 19.5 microns, this merino is fine enough that the vast majority of wearers find it comfortable directly against skin, and the 30% silk content softens the hand further. If you've found previous wool layers itchy, those were almost certainly coarser wool (24+ microns) — fine merino at this micron count is meaningfully different. A small percentage of people are still sensitive to wool regardless of fineness; if that's you, this wool/silk blend is the gentlest option to try.
How warm are 190 gsm long johns? Can I ski in them?
190 gsm is a true four-season weight — light enough for above-freezing temperatures and active use, warm enough as a base layer in genuinely cold weather when paired with insulated outerwear. Most skiers wear this weight under softshell or insulated ski pants comfortably down to single-digit Fahrenheit / negative Celsius temperatures. For static, deep-cold activities like ice fishing or stand hunting in extreme cold, consider layering a second mid-weight piece or choosing a heavier 250+ gsm option as a primary layer.
Can I wear them as pajamas?
Yes, and many owners do exactly that. Wool/silk regulates body temperature actively during sleep, so you don't get the overheating you can get from cotton or fleece pajamas. The wool also wicks moisture away if you sweat at night, keeping you dry. The fine-rib knit is soft enough to sleep in directly against skin.
How do they fit — true to size or do I size up?
European sizing runs slightly slim by US standards, but the wool/silk fabric is very stretchy. Most men find the size that matches their actual waist measurement fits well. If you're between sizes, or you have a longer inseam, size up — there's plenty of give in the fabric. The reinforced ankle cuffs are designed snug to prevent ride-up.
What's the difference between IVN BEST and GOTS?
Both are organic textile standards covering fiber farming through finished garment. IVN BEST is the stricter of the two — it's a German standard that goes beyond GOTS by prohibiting synthetic blending entirely above certain thresholds and applying tighter limits on chemical finishes. These long johns meet both. In plain terms: this is among the most rigorously certified wool clothing you can buy.
How often do I actually need to wash them?
Far less often than synthetic thermals. Wool's natural odor resistance means most wearers go a week or more of regular wear before washing, simply airing them out between uses. After heavy activity (skiing, hiking, sweating), a hand wash is appropriate; after lounging or sleeping, airing is usually all you need.
Are these worth the price?
These are German-made from certified organic wool and silk, knit and sewn at Engel's own facility. The fabric, fit, and finish are noticeably different from mass-produced thermals. With proper care they last many years — most owners report 5–10+ years of regular wear. Per wear, the math usually works out favorably compared to replacing cheaper thermals every season or two.
