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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Man wearing Trunk in Organic Cotton Rib - Mustard / Sand, showcasing modern European cut and comfortable fit.
Trunk in Organic Cotton Rib - Mustard / Sand, modern cut with comfort and support, wearing mustard rib underwear.
Trunk in Organic Cotton Rib - Mustard / Sand, showing a modern European cut and soft ribbed texture.
Trunk in Organic Cotton Rib - Mustard / Sand worn by model, showcasing modern cut and soft rib fabric.

Trunk in Organic Cotton Rib - Mustard / Sand

Sale price$35.00 AUD
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Bone Brown Camel Camel Brown Tar Teal Sage Bone Lines Brown Camel Indigo Lake Lake Indigo Pandanus Camel Forest Stone
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Made with GOTS Organic Cotton

OEKO-TEX® Certified

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Free Shipping Over $120

Easy Returns

Trunk in Organic Cotton Rib - Mustard / Sand is a modern European cut designed for a clean line and a comfortable, supportive fit. The body fabric is made from GOTS-certified organic melange rib in Mustard, with a small amount of elastane to allow natural movement and maintain shape. The rib structure adds subtle stretch and texture, keeping the fabric soft, breathable, and balanced for everyday wear.

The leg openings are finished with cotton binding to help the trunk stay in place without digging or riding up. This detail ensures a stable fit that moves with you rather than against you. The waistband is rich cotton, smooth and secure, holding comfortably without creating pressure. It’s finished with a minimal stone.kin logo understated, refined, and purposefully quiet.

Trunk in Organic Cotton Rib - Mustard / Sand offers a mid-length profile that provides coverage without bulk. The silhouette is tailored but relaxed enough for daily wear supportive where needed, soft everywhere else. The organic cotton helps regulate temperature and reduces irritation, making it suitable for all day comfort, warm climates, or sensitive skin.

The Mustard melange body pairs with a Sand waistband for a warm, grounded tonal contrast subtle, natural, and easy to integrate into your rotation.

No synthetic. No toxins.

No excessive branding.

Just thoughtful cut, dependable fit, and organic cotton comfort.

Fast & Free Shipping on Orders over $120 to Australia, NZ , UK. US Orders over $150 (with duty and tax covered)

  • 5 stars: 344 (86%)
  • 4 stars: 39 (10%)
  • 3 stars: 5 (1%)
  • 2 stars: 8 (2%)
  • 1 star: 2 (1%)
Some of the reviews shown are from related products the merchant grouped with this one.
A
Anonymous

So comfy.

M
Michael

Ordered one Trunk and one Boxer, both in size S. Instead, I only received the Trunk in a size M, and the Boxer was completely missing. I contacted customer service twice, once via email and once through their website contact form, and waited a full week with zero response. Just complete silence. I’m extremely disappointed, as this was my second order and I was planning on buying more because I liked the product. But given this terrible service, it will be my last. Never again!

M
Michael

Ordered one Trunk and one Boxer, both in size S. Instead, I only received the Trunk in a size M, and the Boxer was completely missing. I contacted customer service twice, once via email and once through their website contact form, and waited a full week with zero response. Just complete silence. I’m extremely disappointed, as this was my second order and I was planning on buying more because I liked the product. But given this terrible service, it will be my last. Never again!

A
Anonymous

So comfortable - the best undies!

T
Thomas

So comfy and stylish!

T
Thomas

So comfy and stylish!

T
Thomas

So comfy and stylish!

J
Jack

Elite Organic Cotton, super comfy!

F
Francois

Boyfriend is hot amd comfortable in them!

F
Francois

Love them, the fit is on point!! Wish there were more coulours

F
Francois

Love the fit and how the feel is so light!

Would love more coulour.

I
Ian

I wanted just to feel a calm grounded kinda hotness when all I’m wearing is my jocks.. not the in your face synthetic sexy that most brands shove in my face. I’ve got the xl men’s brief. Snug but not tight, soft but not slinky. Comfy but not frumpy. Balanced.

a
antonio

the moment i unpacked my new underwear i was in love. soft, breathable, classic and feels like butter on my skin. my toosh adores them! coming back for more without a doubt, i only want stone kins.

A
Anonymous

Great colour

J
Jenny

Great colours and beautiful fabric

A
Aaron

Love em!!

G
Grace

Got these as a gift for my partner and he won't stop talking about how comfortable they are!

J
Jacob

Comfortable, good look, nice material.

The only issue is the legs aren’t as long as they look in the photo

J
Jeremy

Very happy with this product, great option for low-tox underwear because of their certifications and they are unbelievably comfy. They do ride up a little (boxer briefs) But not enough to make them not worth it. Very happy.

M
Michael

This is one of the best trunks ive ever worn. Perfect fit, quality is high

M
Michael

Great qualty and fits perfect already ordered more of these

C
Chris

Very comfortable (noticeably more comfortable than other brands).

J
Jenae

Finally a pair of undies for my boyfriend that tick all of the boxes. They look and feel amazing and are extremely comfortable. Going to order 10 more now!

P
P.

Amazing boxers! the size and fit are perfect, soft, great quality organic cotton, it doesn't get better than this!

A
Anonymous

Great fit and comfortable

E
Ethan

Fast Shipping and Super Comfy!

E
Ethan

Fast shipping and super comfy!

A
Anonymous

So comfortable, been looking for something since Hamilton and hare went bust. This fits the bill!

E
Eric

My new favorite briefs! They feel like a cozy sock. The waist doesn’t gather either. I love them!! Oh and they look great on!

A
Anonymous

Perfect 👌 feel and fit

m
michael

I love them! They are true to size, so I’m a 32” waist and bought the M. Also, I like the fact that the branding is small and not covering the entire waistband. Definitely will be buying more.