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All IOS products offer you maximum comfort, modernity and high quality.

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Quality promise

The most comfortable products you've ever worn.

Wearing comfort

Modern fit

No ironing

No wear and tear

No sweating

No odor

Frequently asked questions about our merino sweaters

The IOS TURTLE Merino sweaters are high-quality, functional knitted sweaters made from fine merino wool, developed for style-conscious men who want to combine elegance, comfort and everyday practicality.

All models are:

  • Made from fine, breathable merino wool
  • Temperature-regulating & odor-neutral
  • Pleasantly soft on the skin (no scratching)
  • Dimensionally stable & durable
  • Ideal for business, leisure & travel

IOS TURTLE merino

A classic turtleneck sweater with a clean, minimalist design. It has an elegant, timeless silhouette and a comfortable slim fit.
Perfect for business, events & stylish looks under a jacket or coat.

IOS TURTLE zip merino

A modern pullover with half-zip / zipper collar. Variable wearability: closed or slightly open. A sporty, elegant look with more flexibility.
Ideal for smart casual, travel & changing temperatures

Yes - absolutely. Thanks to the temperature-regulating merino wool:

-> Warm when cold
-> Cool when warm
-> No heat build-up


Perfect for long days in the office, on the road or when traveling.

The fit of both is slim fit:
Close-fitting but comfortable and therefore ideal for layering under a jacket or coat.

If you are between two sizes or prefer a looser fit, we recommend going up a size.

No. High-quality, fine merino wool is used, which is particularly soft and comfortable to wear next to the skin. It is also particularly suitable for sensitive skin.

Yes, both models are suitable for business:

TURTLE merino: ideal under a jacket for an elegant business look

TURTLE zip merino: perfect for business casual & modern office styles

They replace the classic shirt + sweater with a clean, contemporary look.

Yes, merino wool is naturallycrease-resistant and retains its shape. It is also particularly odorless.
This makes it ideal for travel, suitcases and multi-day wear without any loss of quality.

Thanks to merino wool, the IOS TURTLE pullovers are real year-round pieces:

-> Fall & Winter as a warming layer

-> Spring & cool summer evenings as a light layer

Use the size chart on the product page.
The sweaters fit well thanks to the elastic knit structure, but if you are between two sizes, we recommend the larger of the two due to the slim fit.

You can find the information in our returns portal.

Go to the returns portal

Usually you register the return, pack the goods unworn and follow the steps in the portal. Our process is quick and uncomplicated, but if you still have questions, you can also send our customer service team a short email with your request at info@ios-clothing.com at any time.