The Rationalist (Slate/Dark Gray)
The Rationalist (Slate/Dark Gray)
The Rationalist (Slate/Dark Gray)
The Rationalist (Slate/Dark Gray)
The Rationalist (Slate/Dark Gray)
The Rationalist (Slate/Dark Gray)
The Rationalist (Slate/Dark Gray)
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The Rationalist (Slate/Dark Gray)

Real slate shimmers differently on The Rationalist – but guaranteed protection against UV radiation.

$219.00
$219.00

Made from genuine natural materials, with unique variations in color and texture.

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  • Free shipping including tracking

    Our customers benefit from a free and fast shipping in AT and DE. More information here >

  • 24-month warranty

    Within the first 24 months, we will deal with problems that arise during normal use. Find out more >

  • Free 24-day return | Club account

    Club membership is 100% free – members receive a prepaid return label at no extra cost. Even without an account, you can return within 24 days, with a small label fee. Here.

Description

Clear thoughts start with a clear view.

Real walnut wood and slate develop their very own character in sunlight and make The Rationalist your naturally strong companion for bright days.

Thanks to flexible earpieces made of real wood and soft nose pads, your glasses also adapt to your individual face shape — for a comfortable fit all day long.

Find the patron saint for your summer now and enjoy every ray of sunshine with relaxed, alert eyes.

Safe protection guaranteed. Each pair of glasses is a unique piece from nature

Guidance

Technical details

Frame material

High-quality 316L stainless steel in dark gray and customizable nose pads made of silicone.
Temple material

Slate and 316L stainless steel in dark gray. ironing ends made of real walnut wood (flexibly adaptable to your face shape).
Lenses

CR-39 glass in gray with UV 400 protection and light filter category 2.
Size

44 x 145 mm (frame width x temple length)

No two pieces are the same
Over 2 million customers worldwide
Genuine natural materials
UV 400

Core features

Slate

Slate is formed deep inside the Earth, where immense pressure creates layers and compacts the rock over millions of years. Its dark, matte surface appears calm yet powerful – almost like a testament to the history of the Earth. In our unique pieces, slate represents the incredible tranquillity of the darkest depths and the power of time, a reminder of true strength and stability every day.

UV 400

Whether you’re on the beach, in the city or snowboarding on the mountain tops, with your Holzkern sunglasses you are always optimally protected. Sunglasses with UV 400 protection prevent all UV rays with wavelengths between 280 to 400 nanometres from reaching your eyes. With these kinds of sunglasses, all ultraviolet A, B and C rays that are dangerous for the eye are blocked.

Adjustable temple ends

Exceptionally comfortable to wear, custom-made for you. With a little care, the temple ends of these glasses can be adjusted to your individual face shape, ensuring an optimal fit. As they are made of real wood, you should always handle with the utmost care. To make adjustment easier, you can warm them up slightly, either with your fingertips or carefully with a hairdryer.

THE ART OF THE TRADE

Where nature meets craftsmanship

Every HOLZKERN piece begins with genuine natural materials from the forests, mountains, and oceans of our planet. With precision, experience, and innovative technology, we preserve nature's unique character and make it wearable every day. The result: accessories that are as individual as you are and remind you of your uniqueness for years to come.

What we stand for

01
Naturally one of a kind

Nature through and through—that's what our watches and jewelry stand for. The unique grains and textures of wood and stone make every HOLZKERN product truly one of a kind.

02
The HOLZKERN family

When you shop with HOLZKERN, you support a young family business founded in Upper Austria in 2016.

03
Sustainably packaged

Our watches, bandlets, and jewelry come beautifully packaged in wooden boxes. We also use recycled paper to protect your order during shipping, and our self-sealing boxes mean we don't need plastic tape.

04
Order today, enjoy it in three - five days

As soon as you place your order, your one-of-a-kind piece is on its way to you. Too fast? No worries - you have 24 days after delivery to change your mind if you're not completely satisfied.

“With Holzkern I always want to express my love for nature and have set myself the goal of creating the perfect piece of nature for everyone.”

Elias Ferihumer

Founder of Holzkern