Bio Butter: Sustainable Organic Underwear

Bio Butter

 

Meet Bio Butter, our challenger fabric

 

Bio Butter is our signature fabric, and the reason so many people say they forget they’re wearing their Nala. It’s soft, smooth and stretchy, like a buttery second skin that hugs your bumps and bits without squashing them.

 

It’s also made differently. Instead of petroleum-based nylon, Bio Butter uses bio-based nylon made from regenerative sources such as industrial corn starch, which reduces our reliance on fossil fuels.

 

What’s actually in it

 

No vague eco claims, just the deets.

 

  • Composition: 85% bio-based nylon, 15% elastane.
  • Where it comes from: Regenerative bio-based sources such as industrial corn starch, instead of petroleum.
  • How it feels: Soft, smooth and supportive, with medium stretch. Designed for everyday comfort and structure.
  • Certification: OEKO-TEX® Standard 100, so it’s tested for harmful substances.

 

We’re not going to pretend we’ve cracked sustainability. We haven’t. But Bio Butter is a choice we can actually explain, certificates and all. And because it holds its shape wash after wash, you can buy what you need, not more.

 

What we make in Bio Butter

 

Bio Butter bras

 

Bra What it’s like Rating
Support Wirefree Bralette Our bestseller: lined cups, no wire, B to J cups 4.8
Strapless Underwire Bra Stays put, converts four ways, up to H cup 4.6
Bio Underwire Bra Unpadded t-shirt bra with a side sling 4.6
Bio Comfort Wirefree Bralette Wire-free with a hidden side sling, B to K cups 4.7

 

 

Prefer no wire? Browse all our wirefree bralettes. Or shop every style in our women’s bras.

 

Bio Butter undies

 

Undies Cut Rating
Bio High Waist Brief High waist, mesh front lining, cotton gusset 4.9
Bio High Waist High Leg High waist with a higher leg cut 4.9
Midi Brief Mid-rise, with a Flossy Mesh side panel 4.8
Bio High Waist Gee High waist at the front, gee at the back 4.9

 

Want the whole range? Explore our women’s underwear, or complete the look with our bodysuits.

 

Colours that aren’t boring

 

Sustainable doesn’t have to mean dull. Bio Butter comes in classics like Licorice, Snow Cone and Almond Milk, nudes like Desert Dust and Chocolate Mousse, and brights like Watermelon, Kiwi, Acai Bowl and Raspberry.

 

Our other fabrics

 

Bio Butter isn’t the only fabric we can explain. Prefer a breathable, sheer feel? Try our mesh underwear in Flossy Mesh, which is 82% recycled nylon from textile offcuts. Love a softer, cotton-like feel? Shop our Better Than Cotton range, made from 92% modal.

 

Find your size

 

Our Bio Butter bras run from B to K cups depending on the style, and our Bio Butter undies come in XS to 6XL. Not sure of your size? Use our bra size calculator to find your fit, then check our underwear size guide for briefs.

 

Keep browsing

 

Need a sweetener? Enjoy free shipping on orders over $80 across Australia, plus a 30-day money-back guarantee to make sure it’s the right match. Love a bargain? Keep an eye on our Black Friday sale to stock up on Bio Butter.