Ultra-thin lightweight SlimCore™ Tone & Sweat Belt by GYM IN A BOX® with smart digital controller and adjustable comfort fit
SlimCore™ Tone, Sculpt & Sweat Belt — total length up to 130 cm (51 in) with extension strap, one size fits S–XXL. ToneUp15® Pulse Body StimFit Technology. For women and men (unisex).
SlimCore™ Abs & Waist Toning Belt — for women & men. 7 toning modes, 20 MicroCurrent Pulse intensity levels, 4 heat levels, auto timer shut-off.
Luxury wellness lifestyle image featuring the ultra-thin SLIMCORE™ Tone & Sweat Belt for everyday body activation and heat-enhanced wellness
SlimCore™ Tone, Sculpt & Sweat Belt — man relaxing on the couch at home wearing the beige-golden belt on his waist, wireless controller with display on the belt, 15-minute toning session, for women & men.
SlimCore™ Tone, Sculpt & Sweat Belt — size and feature graphic with a woman wearing the belt: one size fits S–XXL, belt length 950 mm (95 cm), heat plus patented ToneUp15® Body Pulse Technology, for women & men.
SlimCore™ Tone, Sculpt & Sweat Belt by GYM IN A BOX®. Close-up of a person wearing a pink sports bra and using the belt.
SlimCore™ Tone, Sculpt & Sweat Belt worn by a woman in white activewear relaxing on a bed wrapped in a cozy blanket, beige belt with wireless controller on her waist
SlimCore™ Tone, Sculpt & Sweat Belt — the beige-golden belt standing on a yoga mat in a bright living room, for women & men.
SlimCore™ Tone, Sculpt & Sweat Belt worn on the waist by a woman in a white tank top sitting at a desk with a laptop, holding a coffee cup
SlimCore™ Tone, Sculpt & Sweat Belt worn by a woman in white activewear sitting cross-legged in meditation pose on a yoga mat, beige belt with wireless controller showing heat warmth visualization
SlimCore™ Tone, Sculpt & Sweat Belt — video: the beige-golden belt with its black controller on a gray background.
SlimCore™ Tone, Sculpt & Sweat Belt — what's in the box: the belt showing its electrode pattern, smart controller, USB charging cable and user manual, 7 modes and 20 MicroCurrent Pulse intensity levels, for women & men.
SlimCore™ Tone, Sculpt & Sweat Belt — smiling woman taking a mirror selfie at home, holding the slim beige-golden belt with its wireless controller, ultra-thin and portable, for women & men.
SlimCore™ Tone, Sculpt & Sweat Belt — video: woman in gray activewear wearing the beige-golden belt at home, for women & men.
SlimCore™ Tone, Sculpt & Sweat Belt — advertisement graphic of a woman wearing the ultra-thin belt: silver ion heat therapy and 360° core activation, so thin, so powerful, for women & men.
SlimCore™ Tone, Sculpt & Sweat Belt — infographic of a woman wearing the belt: heat, pulse, sculpt, with wear-anywhere panels at the gym, at yoga, at home and at work, for women & men.
SlimCore™ Tone, Sculpt & Sweat Belt — close-up of a woman at the gym wearing the beige-golden belt with its controller on her waist, for women & men.
SlimCore™ Tone, Sculpt & Sweat Belt — woman doing a seated yoga stretch at home wearing the beige-golden belt, for women & men.
SlimCore™ Tone, Sculpt & Sweat Belt — comparison graphic: 'Ordinary Sweat Belt vs. SlimCore — One looks good. One does more.' A woman wears a passive black sweat belt on the left and the beige-golden SlimCore belt with its digital controller on the right: sculpts the look of your waist, tones abs while you sweat, warming skin-care routine. ToneUp15® Pulse Body StimFit Technology, 7 modes, 20 MicroCurrent Pulse intensity levels. For women and men (unisex).
Gym In A Box®

SlimCore™ Tone, Sculpt & Sweat Belt

Regular price $389.00 Sale price $199.00
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FREE SHIPPING FROM BEVERLY HILLS, CA. Shipping details.
ONE SIZE FITS S–XXL — TOTAL LENGTH UP TO 130 CM (51 IN) WITH EXTENSION STRAP
MEDI SPA GRADE TONING & WELLNESSGYM IN A BOX®

TONE. SCULPT. SWEAT.

SlimCore™ is a microcurrent toning and sculpting belt in a slim, beige-golden design — powered by patented ToneUp15® Pulse Body StimFit Technology. Worn directly on bare skin, fully wireless with no gel pads, it delivers targeted core activation with gentle warmth in a programmed 15-minute session — plus a skin-rejuvenation function, for a complete tone, sweat and skin routine that fits real life.

U.S. PATENTED • AS SEEN ON TV • SHIPS FROM BEVERLY HILLS

$199 · FREE SHIPPING from Beverly Hills, CA · Shop now, pay later — interest-free installments available at checkout · 30-day returns on regular-price items · One size fits S–XXL

Why Choose SlimCore™?

Best for: women who want an ultra-thin, lightweight belt for discreet everyday, office, travel or home use.

  • Targeted core activation — ToneUp15® Pulse Body StimFit Technology makes your abdominal muscles contract on their own, in 15-minute sessions that fit work, travel or downtime.
  • Sweat and heat support — controlled warmth in 4 heat levels — builds a sweat-focused routine that helps you feel the work while you tone.
  • Skin rejuvenation — a dedicated skin-rejuvenation function makes SlimCore™ the belt that cares for your skin while it tones and sculpts. The skin-contact surface carries a silver ion antibacterial coating.
  • Your session, your settings — 7 modes (preset pulse patterns), including Waist & abdomen kneading, Waist & abdomen massage and Automatic — made for your waist and abdomen — and 20 MicroCurrent Pulse intensity levels (strength), so you start gentle and increase only to your comfort. You control the heat and the strength.
  • Prompt sound — audible prompt tones confirm your mode, heat and intensity as you set them — no need to look down.
  • One size fits S–XXL — the included extension strap extends the belt to 130 cm (51 inches), and the slim, flexible profile sits discreetly beneath clothing.

How to Use

  1. Strap SlimCore™ snugly around your waist, directly on bare skin — never over clothing. The activation needs direct skin contact; clothing can be worn over the belt.
  2. Press the button on the wireless controller, choose your mode and intensity, and start low.
  3. Live your life — the 15-minute session runs automatically and shuts off on its own.

What to Expect

You will feel the activation and the gentle warmth from your very first session. Visible toning builds with consistent daily use alongside your routine — sweating during a session is the warmth at work, not fat loss, and individual results vary.

What’s Included

  • SlimCore™ belt
  • SlimCore™ controller
  • Charging cable
  • User guide

Specifications

  • Ultra-thin, flexible beige-golden body that wraps comfortably and sits discreetly under clothing
  • Controlled warmth and sweat support — 4 heat levels
  • Silver ion antibacterial coating on the skin-contact surface
  • 7 pulse modes and 20 MicroCurrent Pulse intensity levels
  • Prompt sound confirms power, mode and intensity changes
  • Auto timer — shuts off automatically when the cycle ends.
  • Rechargeable for on-the-go sessions
  • Compact enough to travel with
  • Wireless — no wires or gel pads
  • 15-minute automatic session
  • One size — fits sizes S–XXL. Length with extension strap: up to 51 inches (130 cm).
  • For women and men (unisex).

Frequently Asked Questions

What size do I need?
SlimCore™ is one size and fits S–XXL. With the extension strap, the belt length reaches 130 cm (51 inches).

Does it heat up?
Yes — SlimCore™ adds controlled warmth with a sweat effect, with 4 heat levels, selected on the controller.

SAFETY

Adult use only. Not for use during pregnancy. Do not use with a pacemaker or implanted electronic device.

CONSULT YOUR DOCTOR: If you have a medical condition, pacemaker, implanted device, are pregnant, or have any concerns, consult your doctor before use.

GYM IN A BOX® consumer fitness devices are intended for fitness and wellness use and are not intended to diagnose, treat, cure, or prevent any disease or medical condition. Individual experiences and results may vary.

PATENTED TECHNOLOGY • CREATED BY CRISTIANI'S BALANCE FITNESS & NUTRITION, LLC

Our proprietary wearable technology is protected by U.S. patents, including U.S. Utility Patent No. 11,925,799 B2 and U.S. Design Patent No. D846,836 S.

GYM IN A BOX® USA | ToneUp15® StimFit Technology

Designed and developed in the USA • Established 2015.

What is GYM IN A BOX®?

GYM IN A BOX® is wearable muscle-activation technology from Beverly Hills, since 2015 — and As Seen On TV. Our belts, apparel and devices run on patented ToneUp15® Pulse Body StimFit Technology: wireless, no gel pads, worn on bare skin. Home, work or travel — no gym required.

How does it work?

Press the button on the wireless controller. Gentle microcurrent pulses make your muscles contract on their own — real muscle work while you go about your day. Modes are preset pulse patterns, intensity levels are strength: start low, increase gradually.

How long is a session?

One toning session is 15 minutes — that's our recommended usage for one session, and it's what ToneUp15® is built around. Your device shuts off automatically when the session ends. Some wearables run longer cycles — the PowerPants and the PowerShirt, for example. You can use your device for up to two sessions a day; just follow the instructions for your specific device.

Do I wear it over clothing?

No — the devices need direct skin contact, so wear yours on bare skin, never over clothing. Once it is in place, your clothes can go over the device.

What does it feel like?

A tingling, pulsing sensation as your muscles contract — the stimulation working, not vibration. Start low; increase gradually, only when the device sits correctly and feels comfortable.

Who should not use it?

For adult use only. Do not use during pregnancy, and do not use with a pacemaker, defibrillator or another implanted electronic device — and never while driving, sleeping or bathing. With any medical condition or concern, consult your physician before use.

GYM IN A BOX® consumer fitness devices are intended for fitness and wellness use and are not intended to diagnose, treat, cure, or prevent any disease or medical condition. Individual experiences and results may vary.

How do I choose my size?

Use the size guide on each product page. SlimCore™ is one size, fits S–XXL. Do not size down for extra compression — the zones must sit correctly against your skin.

How long do I charge it?

About 90 minutes for a full charge before first use, using the supplied accessories. Keep controllers away from water.

Why don't I feel it working?

Check the charge and placement, and make sure the contact areas sit fully against your skin. Many systems have load detection and will not activate otherwise; that is a safety feature, not a defect. Still stuck? Email us a photo or short video of your setup.

How do I clean my wearable?

Remove the controller and electronics first. Hand wash only where your product's care instructions allow, keep electronics away from moisture, and air dry. Never put a controller in water, a washing machine or a dryer.

What are the shipping times?

FREE U.S. shipping. Orders ship from Beverly Hills, California — most deliveries arrive within 5–7 working days, with tracking when your order ships.

Can I pay in installments?

Yes — shop now, pay later, with interest-free installment options at checkout.

What is the return policy?

Eligible regular-price items may be returned within 30 days, unused and in their original packaging. A return authorization is required first, and a $39 return-processing fee applies (restocking, repacking and outbound shipping). Stated plainly: sale, clearance, promotional and discounted purchases — including orders placed with a discount code — are final sale. Once your return is authorized, we will give you the return address and instructions.

How do I contact you?

Email our U.S.-based support team at info@gyminabox.la.

Customer Reviews

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J
Jenny Oksinova
This is the best abs belt for women

I tried a lot of those but this is the best for women I believe. ! Felt the difference after the first use, love it. Jenny