Front view of black Essential Racerback Sports Bra by BRANWYN. Merino Wool compressive bra wicks sweat and keeps you dry through hikes, skis and workouts.
Close-up detail of racerback design on BRANWYN Racerback Sports Bra in black. Seamless Merino wool provides compressive, breathable support.
Front view of BRANWYN Merino wool Racerback Sports Bra in black. Eco-friendly nontoxic sports bra for women, breathable and moisture-wicking.
Yoga stretch in BRANWYN Racerback Sports Bra. Sustainable Merino bra for women, flexible and supportive for workouts and outdoor activity
Front view of black Merino Wool sports bra, stink free racerback sports bra made of natural fibers that wick sweat and keep you dry and cool.
Close up of woman stretching in black BRANWYN Racerback Sports Bra designed with compression knit to keep you snug and supported through workouts.
Woman stretching with hands over her head in the black BRANWYN Racerback Sports Bra. Sustainable Merino wool sports bra for women.
Woman stretching in camel yoga pose in the Essential Racerback Sports bra in black by BRANWYN. Seamless and sweat wicking Merino sports bra to keep you dry during workouts.
Woman standing beside a river in BRANWYN Racerback Sports Bra in natural white. Merino seamless sports bra with sleeve for pads.
Woman doing yoga wearing BRANWYN Seamless Merino wool Racerback bra in dark green.
Fabric detail of BRANWYN Deep Willow dark green seamless Merino wool & natural fiber Racerback sports bra.
Back view of BRANWYN Essential seamless Merino Wool Racerback Sports Bra in dark green.
BRANWYN Essential Seamless Merino Wool Racerback Sports Bra in Deep Willow dark green.
Back view of woman with ponytail wearing BRANWYN dark green Essential Seamless Merino Wool Racerback Sports Bra.
BRANWYN seamless Merino wool Racerback Sports Bra in Slate, front view in a tree pose, worn with matching Slate compressive leggings

Essential Racerback Sports Bra

$85.00 USD
508 reviews
508 reviews
Merino wool benefits listed with icons: [Sheep icon] Merino wool = Sweat free freshness [Knit icon] Seamless knit = Second skin comfort [Sustainability icon] ZQ Merino = Ethical and sustainable fiber
BRANWYN Merino wool Essential Busty Bra size guide slider.
Color:Slate
Size:S
Quantity:
In stock

Racerback Sports Bra Size Guide

Size guide banner
A/B C D DD F G
<30 XS XS XS XS S S
32 S S S S S/M M
34 S/M S/M M M M M/L
36 M/L M/L M L L L/XL
38 L L L L/XL XL XL
40 XL XL XL XL/XXL XL/XXL XXL
42-44 XXL XXL XXL XXL XXL XXL

Tell me about fit:

UPDATED 5.13.26: Our Essential Racerback Sports Bra is intentionally designed to fit snugly against the body for secure, stay-put support. To find your best fit, start with the band—our sizing is based on field testing where two fingers fit comfortably between the band and your body, but not more.

Because this fabric is more compressive than our Essential Busty Bra & Bralette, women with a fuller bust and smaller ribcage may prefer to size up 1–2 sizes for their ideal balance of support and comfort.

If you prefer a slightly less compressive feel overall, we also recommend sizing up. And if your new bra feels just a touch snug at first, give it a few wears and washes—like most high-performance natural fibers, it will gently relax and mold to your body over time before considering an exchange. Not sure? Please reach out to our Customer Happiness team,

Will it stretch out?

Yes! Performance Innerwear is designed to give a little with wear and washing, molding to your shape while keeping support and comfort.

How to measure your band size:

  • Measure snugly around your rib cage, directly under your bust.

  • Add 3 inches to that measurement.

    • Example: A 31" rib cage + 3 = 34, so your band size is 34.

  • If the result is an odd number, round UP to the next even band size.

    • Example: A 32" rib cage + 3 = 35 → round up to 36.

Racerback Sports Bra Size Guide

Size guide banner
A/B C D DD F G
<30 XS XS XS XS S S
32 S S S S S/M M
34 S/M S/M M M M M/L
36 M/L M/L M L L L/XL
38 L L L L/XL XL XL
40 XL XL XL XL/XXL XL/XXL XXL
42-44 XXL XXL XXL XXL XXL XXL

Tell me about fit:

UPDATED 5.13.26: Our Essential Racerback Sports Bra is intentionally designed to fit snugly against the body for secure, stay-put support. To find your best fit, start with the band—our sizing is based on field testing where two fingers fit comfortably between the band and your body, but not more.

Because this fabric is more compressive than our Essential Busty Bra & Bralette, women with a fuller bust and smaller ribcage may prefer to size up 1–2 sizes for their ideal balance of support and comfort.

If you prefer a slightly less compressive feel overall, we also recommend sizing up. And if your new bra feels just a touch snug at first, give it a few wears and washes—like most high-performance natural fibers, it will gently relax and mold to your body over time before considering an exchange. Not sure? Please reach out to our Customer Happiness team,

Will it stretch out?

Yes! Performance Innerwear is designed to give a little with wear and washing, molding to your shape while keeping support and comfort.

How to measure your band size:

  • Measure snugly around your rib cage, directly under your bust.

  • Add 3 inches to that measurement.

    • Example: A 31" rib cage + 3 = 34, so your band size is 34.

  • If the result is an odd number, round UP to the next even band size.

    • Example: A 32" rib cage + 3 = 35 → round up to 36.

Seamless, compressive support hugs your body while body-mapped contours provide added lift, separation, and stability. The integrated shoulder strap and racerback design maximize mobility, sitting squarely on your shoulders and away from your neck, while providing all-day comfort. Pullover style with removable pad sleeves (pads not included) adds versatility.

Perfect for all your adventures, such as trail running, single-track laps, boulder projects, or your next HIIT session, this bra moves with you wherever your day—or your workout—takes you.

Heavyweight 4-way POWRspun™ knit combines 76% extra-fine ZQ Merino, 14% nylon, and 10% elastane for durability, stretch, and breathability. Naturally sustainable and BPA-, PFAS-, and forever-chemical-free. 

  • built with higher compression and heavier material than our Bralette and Busty Bras
  • Body-mapped contours provide additional support and separation
  • sleeves for removable bra pads (pads not included)
  • pullover style with a racerback design for a full range of motion

Bonus: Our ZQ, OEKO-TEX 100, and RWS-certified Merino is also regenerative and sustainable.

Double Bonus: We hear it all the time… Our Racerback Sports Bra is the high-five you need to crush your next PR.

COMPLETE THE SET

Woman standing with hands on her hips in black compression Merino leggings BRANWYN. Back view of woman wearing black BRANWYN Merino leggings, winter leggings made from breathable Merino wool for hiking and skiing.
Essential Compressive Legging 28"
$158.00 USD
Side view of woman wearing grey high waisted Merino underwear by BRANWYN. The Essential Hipster high waisted moisture wicking underwear. Woman wearing BRANWYN's Essential Hipster: light grey high waisted Merino Wool Underwear and matching Merino Wool bra.
Essential Hipster
$40.00 USD

PERFORMANCE WITHOUT COMPROMISE

Designed for superior performance and maximum comfort—it all starts with Merino wool. Super-soft, ultra-fine Merino wicks sweat to keep you dry, fresh, and funk-free. The natural crimp of its fiber traps air so you stay cool when things heat up and keep warm when there’s a chill.

Moisture wicking

Naturally breathable

Temperature regulating

Benefits of Merino wool icon: Odor-resistant quality of seamless Merino wool

Odor Resistant

BUTTERY SOFT NATURAL FIBER

GYNECOLOGIST APPROVED