Stone.kin – Organic Cotton Underwear Made for Comfort, Safety & Everyday Ritual

Organic cotton underwear buttery soft comfort. Our naturally nude essentials are crafted with the Earth in mind.

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Trunk in Organic Cotton Rib - Sand with Tar Cross

Sale price$24.50 AUD Regular price$35.00 AUD
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Made with GOTS Organic Cotton

OEKO-TEX® Certified

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The Trunk in Organic Cotton Rib Men's Sand with Tar Cross is crafted for those who value simplicity, softness, and structure. Cut in a modern European silhouette, it’s made from GOTS-certified organic melange rib cotton naturally breathable, buttery soft, and kind to your skin. A hint of elastane adds flexibility and shape retention, ensuring the trunk moves with you effortlessly.

Finished with cotton leg binding for a smooth hold and a rich cotton waistband featuring the minimal stone.kin logo, this piece embodies refined comfort. The Sand with Tar Cross hue reflects Stone.kin’s connection to nature earthy, understated, and timeless.

Every Trunk in Organic Cotton Rib Men's – Sand with Tar Cross is crafted consciously: non-toxic, plastic-free, and made to last. Designed to feel like a second skin while keeping its form wash after wash.

At Stone.kin, we believe comfort is the foundation of confidence. This trunk delivers both blending modern design with the softness of organic cotton, so you can move, rest, and live with ease.

Key Features

  • GOTS-certified organic cotton melange rib
  • Naturally soft, breathable, and durable
  • Modern European trunk cut
  • Cotton leg binding and waistband
  • Minimal stone.kin logo
  • Colour: Sand with Tar Cross



  • 5 stars: 399 (87%)
  • 4 stars: 41 (9%)
  • 3 stars: 5 (1%)
  • 2 stars: 8 (2%)
  • 1 star: 7 (2%)
This product has no reviews of its own. The merchant grouped it with related products, so the reviews shown are from across that group.
D
Daniel

I’m glad I waited a while to write a review. Upon first wearing them, I was pretty disappointed. The size small that I ordered seemed too big. I couldn’t believe they were the smallest size. But after wearing a couple times, I grew to absolutely love them. They didn’t lose their shape by the end of the day the way some can, and are incredibly soft and comfortable. Now I can’t believe I was wearing such tight undies for so long. I had no idea what I was missing.

A
Anonymous

Super comfortable

e
elliott

Took weeks to get it and yet still worth the wait

Hi Elliott,

Thanks so much for your patience! International shipping times can vary depending on the destination and local postal services. We really appreciate your understanding and patience.

Kind regards,
Stonekin Team

G
Greg

Awesome and really comfortable

A
Anonymous

Great material with the right amount of length. Will be my go to boxer briefs

D
Diego

Excellent pair. So soft on the skin 👍🏻

T
T

Great aesthetic, and pretty comfortable! The colors and fabric texture are super cool!

T
T

Great aesthetic, and pretty comfortable! The colors and fabric texture are super cool!

T
T

Great aesthetic, and pretty comfortable! The colors and fabric texture are super cool!

K
Kevin

A bit less fabric than expected. Would prefer someone of a rugby build as well in photos as those of us with bigger thighs need a better representation.

K
Kenny

The best quality and comfort by far.

A
Anonymous

Amazing underwear

A
Anonymous

Excellent underwear. Super comfortable.

S
Sanjit

never received

Hi there,

We’re so sorry to hear you haven’t received your order. Could you please reach out to our team via our direct email address so we can look into this for you and help resolve the issue?

Kind regards,
Stonekin Team

B
Blayne

Softest most comfortable underwear. My wife is conscious of the materials we wear. Will definitely be getting more Stone.kin and I imagine these will be the only brand we wear

D
Dave

I now nearly have a pair for each day of the week - that's the goal: every colour combination there is. But the next step is to buy my woman a voucher ❤️

A
Anonymous

Amazing quality. My partner loves them.

A
Anonymous

Good fit and comfy

A
Anonymous

Great colours & super comfortable

Z
Zara

Amazing

A
Anonymous

Simply perfect. Pure natural cotton comfort. The quality and fit is outstanding. I’ll be purchasing more.

D
Declan

Just love this brand, it’s my 4th purchase.

A
Antonio

terrific underwear, i've replaced all of my underwear now with stone kin and i am so chuffed. will continue to purchase as they wear down. (:

R
Ronnie

My wife put me on to these guys and finally a male underwear manufacturer that provides a soft stretch waist band that doesn't squeeze your stomach like an elastic band!!!
It's good to see someone is prepared to actually use the correct stretch materials instead of the cheap nasty ones used by the likes of Bonds.
As for fit, comfort and style, all excellent.
Highly recommended!

P
Paul

Love the forest Green its my new favourite colour. Stonekin briefs are so smooth and fit beautifully !

N
Nick

Feel really quality and look great

A
Anonymous

Excellent quality and customer service. Super comfortable and could not be happier with my purchases in the past and today.

R
Robert

Hello, I bought 6 pairs of these paints within this order and a further order in Nov 2025. Of the 6 pairs, 3 have torn where the waste band is stitched together on the side - see photos attached of two of the pairs. Messaged Stone Kin for comments but have not heard back. Colours are great but cannot recommend as the quality is really disappointing. I would expect that I am not the only person that has had this issue.

Hi Robert,

We’re so sorry for the disappointment and appreciate you bringing this to our attention. We responded to you promptly and have been in touch privately to resolve the issue. We’ve also issued a refund for the three faulty items.

Kind regards,
Stonekin Team

R
Robert

Hello, I bought 6 pairs of these paints within this order and a further order in Nov 2025. Of the 6 pairs, 3 have torn where the waste band is stitched together on the side - see photos attached of two of the pairs. Messaged Stone Kin for comments but have not heard back. Colours are great but cannot recommend as the quality is really disappointing. I would expect that I am not the only person that has had this issue.

Hi Robert,

We’re so sorry for the disappointment and appreciate you bringing this to our attention. We responded to you promptly and have been in touch privately to resolve the issue. We’ve also issued a refund for the three faulty items.

Kind regards,
Stonekin Team

R
Robert

Hello, I bought 6 pairs of these paints within this order and a further order in Nov 2025. Of the 6 pairs, 3 have torn where the waste band is stitched together on the side - see photos attached of two of the pairs. Messaged Stone Kin for comments but have not heard back. Colours are great but cannot recommend as the quality is really disappointing. I would expect that I am not the only person that has had this issue.

Hi Robert,

We’re so sorry for the disappointment and appreciate you bringing this to our attention. We responded to you promptly and have been in touch privately to resolve the issue. We’ve also issued a refund for the three faulty items.

Kind regards,
Stonekin Team