femme portant une brassière de sport hastko BRA N°42 #color_true-black #modal_s

Bra number forty-two Ultra-light, “no bra” feel EXTREME SUPPORT

FIND YOUR SIZE

Zero seams. Zero friction. Zero distraction.

— 100% seamless: 3D-molded, bonded, and printed construction for absolute comfort. Nothing rubs, nothing irritates — just the feeling of a second skin.
— Encapsulation without compression: the bust is supported, never constrained. Natural hold, effortless breathability.
— Wide, flat straps: stable and smooth, they never dig into the shoulders.
— Wide underbust band: even support, soft pressure, zero discomfort.
— No wires, no adjusters: nothing tight, nothing shifting — only freedom to move.
— Thin, removable cups: stay perfectly in place, even after washing.
— Developed with 42 runners prone to skin irritation — tested, refined, and approved in motion.
— Designed in Chamonix-Mont-Blanc by the Hastko team — born in the mountains, made for movement.

Made in China, in one of only two factories in the world capable of reaching this level of innovation. Partner selected for its unique expertise in 3D printing and textile engineering, and for its GRS, WRAP, BSCI, GRS, and ISO9001-2000 certifications.

Taille de bonnet

Maintenance

Welded, thermoformed and 3D printed

Activity

Designed for prolonged endurance efforts

Second skin feel

Prevents irritation and chafing

SPORTS BRA N°42

Zero seams. Zero friction. Zero distraction.

— 100% seamless: 3D-molded, bonded, and printed construction for absolute comfort. Nothing rubs, nothing irritates — just the feeling of a second skin.
— Encapsulation without compression: the bust is supported, never constrained. Natural hold, effortless breathability.
— Wide, flat straps: stable and smooth, they never dig into the shoulders.
— Wide underbust band: even support, soft pressure, zero discomfort.
— No wires, no adjusters: nothing tight, nothing shifting — only freedom to move.
— Thin, removable cups: stay perfectly in place, even after washing.
— Developed with 42 runners prone to skin irritation — tested, refined, and approved in motion.
— Designed in Chamonix-Mont-Blanc by the Hastko team — born in the mountains, made for movement.

Made in China, in one of only two factories in the world capable of reaching this level of innovation. Partner selected for its unique expertise in 3D printing and textile engineering, and for its GRS, WRAP, BSCI, GRS, and ISO9001-2000 certifications.

Disappears from the very first stride, stays until the end. Invisible, essential — your freedom in its purest form.

Bra number forty-two Ultra-light, “no bra” feel EXTREME SUPPORT

FIND YOUR SIZE

Taille de bonnet

Maintenance

Welded, thermoformed and 3D printed

Activity

Designed for prolonged endurance efforts

Second skin feel

Prevents irritation and chafing

Technical details

Recommended for prolonged exertion and endurance performance
Ideal for road and trail runners up to D cup
Ventilated mesh inserts
Appointed by HASTKO in Chamonix-Mont-Blanc
Not recommended for body types with a small bust and deep cup. Not recommended for high-impact sports for E cups and above.

Composition 61% recycled nylon / 39% elastane.

Subjects 60% recycled content.

Maintenance Wash at 30°C in a protective net. Do not tumble dry. Do not use fabric softener or bleach. Do not iron.

Quand on bouge pendant des heures

Un soutien ciblé qui s'adapte à votre corps et à votre mouvement.

Comfort and support you can feel

Un soutien ciblé qui s'adapte à votre corps et à votre mouvement.

“

Ultra-light and comfortable.

”

— Aurélie V., Wears SPORTS BRA N°42

heat-sealingheat-sealing

Unconstrained performance.

3D printing3D printing

Moving freely is getting back to basics.

dot collagedot collage

Precise support, right where it counts.

Frequently Asked Questions

How to find the right size for SPORTS BRA N°42?

To choose the ideal size, please refer to our size guide available on this page.

How to care for your SPORTS BRA N°42 daily?

Wash at 30°C in a protective laundry bag. Avoid tumble drying, as well as the use of softeners and bleaches. Do not iron.

Does it dry quickly?

Our products are designed with breathable materials and incorporate mesh inserts, allowing for quick drying after exercise and washing.

Is the SPORTS BRA N°42 designed for durability?

Every style comes with a 2-year warranty: if there's an issue, we'll exchange it. Simple, quick. Because a good sports bra isn't chosen for a moment, but for thousands of movements.

Can I return the product if it doesn't fit?

No problem. You have 30 days after receipt to return an item. During the holiday season (November 15 → December 31), this period is extended to 60 days.

SPORTS BRA N°42

"Wonderful, I had stopped running because of chafing and erosion burns caused by my old sports bras, and now this top is a second skin, I'm living again, I'm running again, it's great!"

Nobili.S

SPORTS BRA N°42

"Very comfortable bra, feels like a second skin. Just trying it on while resting, it's nothing like my old bra: a feeling of lightness and comfort. After a while, I could barely feel it anymore. Plus, it's quite pretty and well-made! Thank you!! You won't be disappointed!"

Audrey.T

SPORTS BRA N°42

"Finally, effective and attractive sports underwear. A French brand that makes you dream, with values that align well with mine. I feel beautiful and strong wearing them, and nothing stops me from fully enjoying my sport."

Karin.W

SPORTS BRA N°42

"No chafing after my long runs, whereas with my other sports bras I was completely used to it. It's a pleasure, I don't feel it, it supports correctly, and on top of that, it's super pretty!"

Manon.R