Hocosa wool-silk men’s undershirt – natural warmth under any shirt

That one undershirt you put on once and never want to wear anything else. This wool-silk men’s undershirt by Hocosa is the essential base layer for men who value comfort, quality, and convenience. Made from 70% organic wool and 30% silk, it regulates your temperature effortlessly – warm when it's cold, breathable when you're moving. Perfect under a shirt or sweater, as the low neckline makes it invisible.

Why you’ll want it

This undershirt is designed with the Swiss precision Hocosa is known for. The fine, supple fabric fits your body beautifully without constricting. Thanks to the long length, it stays firmly in place – no more cold backs. And as customers often say: “You barely feel like you're wearing it.” The seams are subtly finished, making them invisible under clothing. Ideal for those who want to stay warm without the bulk.

Wool-silk: the perfect combination

Organic wool provides natural insulation and temperature regulation, while silk makes the garment softer and smoother. Together, they form a breathable blend that adapts to your body. No clammy feeling, no odors – wool is naturally self-cleaning. You hardly ever need to wash this shirt, really! Simply airing it out or hanging it in the bathroom while you shower is usually enough.

Care & washing

Do you want to wash it anyway? Do so cold and with a little Lanalicious wool detergent. Gently pull the shirt into shape after washing and let it dry flat. This keeps the fit perfect. Pro tip: don't wash it too often – organic wool stays at its best when you leave it alone.

Fit & styling

The Hocosa undershirt features a low, round neckline that remains discreet under a shirt, polo, or sweater. Do you prefer something with a higher neckline? Take a look at our wool t-shirts and long-sleeved shirts from Hocosa. The undershirts are available in multiple colors and sizes, ensuring there is always one that suits you.

Sustainable & fair

Hocosa is a small family business from Switzerland that works with organic, GOTS-certified wool and silk. All clothing is produced in Europe under fair conditions – without unnecessary additives, dyes, or treatments. You can feel it in everything: this underwear is pure, breathable, and made to last for years.

Personal advice

Are you unsure about the size or fit? Call us during opening hours at 010-7954177 or email klantenservice@natur-el.nl. Or visit our store at Zwaanshals 376 in Rotterdam, where you can try on and compare the entire collection. We are happy to help you personally with honest advice.

FAQ – frequently asked questions about the Hocosa wool-silk men’s undershirt

What material is the undershirt made of?

The shirt consists of 70% organic wool and 30% silk. Both materials are completely natural, breathable, and temperature-regulating.

How often do I need to wash it?

Hardly ever! Wool and silk are self-cleaning. Airing it out or hanging it in the bathroom while you shower is usually sufficient. Only wash if absolutely necessary, cold, and with a bit of wool detergent.

Is it itchy?

No, absolutely not. Because of the addition of silk, the shirt feels soft and smooth on the skin – even for those with sensitive skin.

What is the best way to wear the undershirt?

Under your shirt, sweater, or jacket. Thanks to the low neckline, it remains invisible and keeps your outer clothing looking neat. Ideal for daily use or while working outdoors in the cold.

Is it available in other styles?

Yes, Hocosa also makes wool t-shirts, long-sleeved shirts, and long johns in the same wool-silk quality. View the entire collection in our webshop or in the store.