UltraTone™ Core Master Abs & Waist Sculptor
Want a tighter, more toned core without living at the gym? UltraTone™ Core Master is a microcurrent toning and sculpting belt — the premium GYM IN A BOX® StimFitBelt™, slim enough to train your abs discreetly under your clothes.
THE DISCREET 360° CORE MASTER.
Premium core, waist and lower-back activation powered by patented ToneUp15® Pulse Body StimFit Technology. Worn directly on bare skin, discreet under clothing, completely wireless with no gel pads — in programmed 15-minute sessions.
$199 · FREE SHIPPING FROM BEVERLY HILLS, CA · 30-DAY RETURNS ON REGULAR-PRICE ITEMS
PATENTED TECHNOLOGY • AS SEEN ON TV
SHOP NOW, PAY LATER — interest-free installments available at checkout.
What UltraTone™ Does for You
- 360° activation: built-in contact points wrap your abs and obliques for full core and waist activation — and you can turn the belt around for soothing, massage-like activation across your lower back.
- Discreet under-clothing wear: slim, lightweight and one size — fits S–XXL, adjustable, it disappears under your clothes — at your desk, on your commute, through your day.
- Belt length: One size fits S–XXL — total length up to 119 cm (46.85 in).
- For women and men (unisex).
- 10 modes, 30 intensity levels: modes are preset pulse patterns, levels are strength. You control the pattern and how strong it feels — start low and build at your own pace.
- Programmed 15-minute sessions: press start and the session runs hands-free, then shuts off automatically.
- Wireless and USB rechargeable: no wires, no gel pads — nothing between the belt and your skin but the belt itself.
How to Use
- Strap it on bare skin. Wrap the belt snugly around your waist, directly against your skin — never over clothing. Your clothes go over the belt, not under it.
- Press the button. Power on the wireless controller, choose your mode and intensity, and start low.
- Live your life. Your core activates on its own for 15 minutes, then the session shuts off automatically.
What to Expect
You will feel the activation from your very first session — real, deep contractions working your abs, obliques and core. Visible toning builds with consistent daily use as part of your routine. UltraTone™ supports muscle toning and strengthening; it is not a fat-loss or inches-lost promise, and individual results vary.
UltraTone™ Questions, Answered
Can I wear it under my clothes?
Yes — that is what it is designed for. It sits slim and discreet under clothing while the 15-minute session runs, at your desk, on your commute or anywhere in your day.
What do the modes and levels mean?
Modes are preset pulse patterns; levels are strength. With 10 modes and 30 intensity levels, you pick the pattern and how strong it feels — always start low and increase gradually to comfort.
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.
During weight-loss journeys—including for adults using GLP-1 medications—maintaining muscle-focused movement, resistance training, and adequate nutrition remains important. This wearable can support muscle engagement as part of that broader routine; it is not intended to prevent or treat muscle loss.
Add to cart — train your core in 15 minutes today.
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.
