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Rated 4.8/5 by 10,000+ happy moms

CoreWrap™ Brief

The postpartum brief that snaps you back without the gym.

Up to 2 inches off your waist, in just a few days.

Supports the gap pregnancy leaves behind (diastasis).

CoreWrap™ 360° band — front, sides & back.

Invisible under your clothes — never rolls down.

Flatter in 2–3 weeks — your jeans button again.

Breastfeeding & C-section friendly.

Worn by moms from days after birth to 40+ years postpartum.
It's never too late.
 
 
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"3 years postpartum, I’d tried workouts, waist trainers, and creams. Nothing worked on my stubborn belly — until this."

Jessica M., Mom of 2
📓 FREE Guide Included: "The 20-Minute Method" ($39.90 value) — 50 pages of daily tips no one ever tells moms, to maximize your results and hit your goal in just 30 days.

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Invisible Comfort, All-Day Confidence

Smooths seamlessly under your clothes with no visible lines. Soft, breathable and designed to stay in place all day without rolling or bunching.

  • Free Size Exchange
  • health_and_safety C-section & diastasis safe
  • Loved by thousands

How It Works

Pull them on and the wrap-around 360° band pulls your midsection flat and erases the muffin top the instant it's on. Here's how the CoreWrap™ Postpartum Brief works for you, from morning to night.

1. 360° wrap-around shaping — The crossed diagonal panels hug your waist from every side, flattening your belly and blurring the muffin top the moment you slip them on.

2. Stay-put high-rise waistband — The extra-wide top band locks in place through the whole day — it won't roll, won't dig in, so the hold never gives out.

3. Undetectable beneath outfits — Flat, edge-free seams vanish under anything you wear; the only thing that shows is a clean, smooth line.

Morning: Step into it just like your everyday underwear.

Afternoon: No rolling, no shifting, no readjusting.

Night: From the office to dinner out, it holds its place perfectly.

90-Day Money-Back

Try it with complete peace of mind. If you are not completely satisfied, you have 90 days to return it for a full refund. No stress, just the certainty of a purchase you can trust.

Features & Fabric

  • Fabric: ultra-soft, breathable second-skin knit that stretches in all four directions
  • Waistband: tall, wide top band that stays put — no roll-down, no pinching
  • Edges: flat, seamless finish with zero panty lines
  • 360° wrap-band: crossed diagonal panels for all-around tummy control
  • Coverage: completely opaque
  • Care: machine wash cold, hang dry. No bleach, no tumble drying.

Size & Fit

A compression fit built to shape and hold you in. Every size maps to your real measurements.

Caught between two sizes? Not here. Pull up the size guide and let the calculator settle it — two numbers in, one size out, no guesswork.

  • XS (US 0–6) — Waist 23.6–28.0" · Hips 33.1–35.4"
  • S (US 8–10) — Waist 28.3–30.3" · Hips 35.8–37.8"
  • M (US 12–14) — Waist 30.7–32.7" · Hips 38.2–40.2"
  • L (US 16) — Waist 33.1–35.4" · Hips 40.6–42.5"
  • XL (US 18) — Waist 35.8–37.8" · Hips 42.9–44.9"
  • 2XL (US 20) — Waist 38.2–40.6" · Hips 45.3–47.2"
  • 3XL (US 22–24) — Waist 40.9–49.2" · Hips 47.6–53.5"

How to measure: Waist — at your natural waistline, just above the belly button, exhale, and keep the tape flat and comfortably snug (not tight). Hips — around the fullest point of your hips and seat.

Made to flatter every body from XS to 3XL, from postpartum all the way through menopause. Still unsure? Our free 90-day exchanges have your back.

Most Common Questions

How fast will I see a difference?

Instantly. The CoreWrap™ 360° band flattens your tummy and smooths your line the second you put it on — no break-in, nothing to wait for.

Will it roll down during the day?

No. The wide high-rise CoreWrap™ band wraps all the way around and stays put from morning to night — no rolling, no digging, no readjusting.

Will it show under my clothes?

No. Fully opaque with flat, seamless edges — no panty line, no ridges under leggings, dresses or jeans. Just a smooth, natural line.

Is it comfortable enough to wear all day?

Yes — firm where you want a flat line, soft everywhere else, in a breathable second-skin fabric. Most moms forget they even have it on.

Which size should I order?

Go by your waist, not your clothing size. Between two sizes? Size up. The Size Calculator on this page picks it for you in seconds — and exchanges are free for 90 days.

Can I wear it postpartum, even after a C-section?

Yes — soft, seamless, all-around support with no hard boning. Most moms start ~2 weeks after a vaginal birth and ~6 weeks after a C-section, once cleared (check with your provider first).

What if it doesn't work for me?

Then you don't pay. Every order is backed by our 90-day money-back guarantee — wear it, wash it, and if you're not in love, we'll refund you. No questions asked.

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    • "I was sure it'd roll like every other one. It hasn't budged once — chasing my toddler all day and it stays put."

      Ashley R. (verified buyer)

    • "Skeptical it'd do much over my c-section pooch. Put it on and my jeans buttoned instantly. Didn't expect to actually see a difference."

      Daniela M. (verified buyer)

    • "Terrified of visible lines. Wore it under a fitted dress — totally invisible, no one could tell. Smooth everywhere."

      Priya K. (verified buyer)

    • "Expected to rip it off by noon. Honestly forgot I had it on — breathable, no digging, comfy enough to wear all day."

       Megan T. (verified buyer)

    • "Nothing fit my new shape after baby #2. This actually hugged me without squeezing. First piece that made me feel like me again."

      Brianna L. (verified buyer)

    • "Figured it'd stretch out fast like cheap shapewear. Washed it a dozen times now and it holds me in exactly like day one."

      Nicole B. (verified buyer)

      30 days. What 1,000 moms told us.

      94%

      felt flatter the first week of wearing it

      89%

      saw a smoother postpartum belly after 4 weeks

      90%

      would tell another mom about it

      Based on a 30-day survey of 1,000 FitSlim CoreWrap™ customers.

      Start My 30 Days

      YOUR QUESTIONS, ANSWERED

      Everything you're wondering about.

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      How fast will I see a difference?

      Right away. The second you pull on the CoreWrap™ Brief you'll see a flatter front and a smoother line — no break-in period, nothing to wait for. That first look in the mirror is usually the convincer. With daily wear, most moms say their midsection feels firmer within 2–3 weeks.

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      How is this different from a regular girdle or shaper?

      Two things moms always bring up: a wide high waistband that refuses to slide down, and smooth edges that vanish under clothes — most shapewear nails one and fails the other. And where ordinary shapers and postpartum belts only press on the front (exactly why they roll and flatten just one spot), the CoreWrap™ 360° band wraps front, sides and back at once. It holds your whole core evenly, so nothing slips and the result looks natural.

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      Will it roll down or slide during the day?

      No — that's the exact problem we built it to beat. The wide high-rise CoreWrap™ band wraps all the way around and stays put from the school run to dinner, even when you sit, bend or scoop up your little one. No rolling down, no riding up, no sneaking off to fix it in the bathroom.

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      Will it show under my clothes?

      It disappears. The fabric is thin and finished with flat, bonded edges instead of bulky stitching, so there's no visible panty line and no ridges to print through. Under leggings, a slip dress, jeans or work clothes, the only thing anyone sees is a smooth, natural line.

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      Is it comfortable enough to wear all day?

      Yes — firm where you want a flat line, soft everywhere else, with none of the breath-crushing squeeze of rigid shapers. Most moms tell us they forget they even have it on, morning to night.

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      Is it see-through? Will it hold up over time?

      Completely opaque, even under stretch, in a breathable second-skin fabric. Wash it cold and hang it to dry and the shaping keeps its grip wash after wash — it won't go slack after a few wears like cheaper shapewear.

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      Which size should I order — and what if it's wrong?

      Go by your waist measurement, not your usual clothing size — after a baby the two often stop matching, and that's exactly who this is made for. Measure around the narrowest part of your torso, a couple of inches above your belly button, keeping the tape level; if you're postpartum, measure above the fullest part of your belly rather than across it, then match it to the size chart.

      Between two sizes? Size up. The range runs from XS all the way to 3XL, and the Size Calculator on this page will do it for you in about ten seconds. If the fit isn't right, our free 90-day exchanges have you covered.

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      When can I start wearing it after birth?

      Most moms start around 2 weeks after a vaginal birth and 6 weeks after a C-section, once they've been cleared. There's no hard boning — just soft, seamless, all-around support. If you're recovering from surgery, check with your provider first.

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      I had my baby years ago (5, 10, even 20+). Will it still work?

      Yes. The gap pregnancy can leave in the abdominal wall doesn't always close on its own, so a softer lower belly years later is completely common — and that's exactly what the CoreWrap™ 360° band is built to hold and support, all the way around. Our customers wear it from days after birth to decades postpartum. It was never about how long ago.

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      I'm going through menopause — will it help?

      Absolutely — it's a favorite through perimenopause and menopause too. When your midsection shifts and old clothes stop sitting right, the brief smooths and flattens so your outfits feel like yours again.

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      I've lost weight and have a softer midsection — will this help?

      Yes. It gives a smooth, flattering line under clothes from the very first wear, which is why it's so popular through a weight-loss journey when you're in between sizes.

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      Do I wear it over my underwear or on its own?

      Either way — it's completely your choice. The gusset is cotton-lined, so it's soft, breathable and hygienic worn on its own, just like your normal pair. Prefer a thin pair underneath? That's absolutely fine too and changes nothing about the shaping or the hold.

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      Do I have to wear it every day?

      You don't have to — but daily is where the difference comes from. Most moms wear it a few hours a day, or right through the day, because steady support does far more than wearing it now and then. Miss a day and nothing's ruined; just make it part of getting dressed in the morning. It's soft enough that you genuinely forget it's on.

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      What is it made of?

      A soft, four-way-stretch seamless blend (nylon and spandex) with breathable mesh panels and a cotton-lined gusset — that mix is the whole reason it doesn't feel like stiff, plasticky shapewear.

      The nylon keeps it thin, silky and breathable, so it stays invisible under clothes and doesn't trap heat through a full day. The spandex gives real compression with recovery: it holds you firmly, moves with you when you sit, bend and lift, then snaps back to shape instead of stretching out.

      No latex, no hard boning, no plastic edges digging in.

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      How do I wash and care for it?

      Machine wash cold on a gentle cycle (a mesh laundry bag helps) and air-dry. Skip the bleach, the fabric softener and the dryer — that's what keeps the elastic and the CoreWrap™ 360° band holding exactly like day one.

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      What if it doesn't work for me?

      Then you don't pay. Every order is backed by our 90-day money-back guarantee — wear it, wash it, live in it, and if you're not in love we'll refund you, no questions asked.

      FitSlim arrives in New York – Experience it live!

      Fitslim is opening its very first popup store in NY!

      This is your unique chance to discover our products in person, try them on, and enjoy personalized advice from our team.

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