
Sizing Chart
| Size | Weight (lbs) | Weight (kg) |
|---|---|---|
| S | 110–154 lbs | 50–70 kg |
| M | 154–198 lbs | 70–90 kg |
| L | 198–243 lbs | 90–110 kg |
| XL | 243–287 lbs | 110–130 kg |
| 2XL | 287–331 lbs | 130–150 kg |
| 3XL | 331–375 lbs | 150–170 kg |
| 4XL | 375–419 lbs | 170–190 kg |
| 5XL | 419–463 lbs | 190–210 kg |
Not sure about your size?
= If you're close to the upper end of a size range, we suggest going one size up for the best fit!
PS: Our sizes are carefully crafted to fit snugly against your body, providing maximum comfort and all-day effectiveness.
LOOK SLIM THE MOMENT YOU PUT IT ON
Instant compression that flattens your chest, smooths your waist, and disappears under any shirt
Instant Confidence - Zero Effort
Most compression shirts apply the same pressure everywhere. Oliron CoreFlex™ is engineered differently, with targeted compression zones that flatten the chest, smooth the waist, and control the belly exactly where you need it most. The result is a leaner, more athletic silhouette the moment you put it on.
Stays Down - Stays Hidden
There's nothing worse than a compression shirt that rolls up every time you sit, bend, or move. That's why Oliron CoreFlex™ features an extra-long cut and a reinforced hem that stays tucked in all day. No riding up. No constant adjusting. Just clean lines from morning to night.
Built to Perform - Wash After Wash
Most shapewear loses its compression after a few washes. Oliron CoreFlex™ is made with premium Ionic Nylon that keeps its shape, maintains powerful support, and stays breathable day after day. From your first wear to your fiftieth, it delivers the same confident fit.
Everything You Need to Know
Is Oliron CoreFlex™ designed specifically for bigger men?
Is Oliron CoreFlex™ designed specifically for bigger men?
Absolutely. Oliron CoreFlex™ was engineered from the ground up for larger body types—not simply scaled up from a standard fit. From the compression zones and longer length to the reinforced waistband, every detail is designed to provide a comfortable, supportive fit where bigger men need it most.
Should I size down for stronger compression?
Should I size down for stronger compression?
No. CoreFlex™ is already designed to deliver optimal compression in your regular size. Simply follow our size chart for the best fit. If you prefer an extra-firm feel, you may choose to size down.
Will it roll up during the day?
Will it roll up during the day?
No. CoreFlex™ features an extra-long cut and a reinforced waistband that helps keep the shirt securely in place throughout the day. Whether you're sitting, walking, or bending, it stays tucked in without constant readjustment.
What areas does CoreFlex™ target?
What areas does CoreFlex™ target?
CoreFlex™ uses targeted compression to smooth the three areas where most men want the most support:
- Chest
- Waist & love handles
- Lower abdomen
The result is a cleaner, more streamlined silhouette under any outfit.
Will people notice I'm wearing it?
Will people notice I'm wearing it?
Not at all. CoreFlex™ is designed to be discreet under T-shirts, polos, and dress shirts. The lightweight, seamless construction remains virtually invisible beneath your clothing.
Is it comfortable enough for all-day wear?
Is it comfortable enough for all-day wear?
Yes. Made with premium 80% Ionic Nylon and breathable performance fibers, CoreFlex™ helps wick away moisture while providing consistent compression, keeping you cool and comfortable throughout the day.
How durable is CoreFlex™?
How durable is CoreFlex™?
Unlike many compression shirts that lose their shape over time, CoreFlex™ is built to maintain its compression and elasticity through 50+ washes, so it continues to perform wear after wear.
What if it isn't right for me?
What if it isn't right for me?
Your satisfaction comes first. That's why every Oliron CoreFlex™ order is backed by our 45-Day Money-Back Guarantee.
If you're not completely satisfied, simply contact us at support@olironhealth.com, and our support team will be happy to help with a return or refund.
Collapsible row
Collapsible row
How do I choose the right size?
How do I choose the right size?
Use our Size Guide to find your recommended fit based on your height and weight.
If you're between sizes:
- Choose the smaller size for firmer compression.
- Choose the larger size for a more relaxed fit.
If you're unsure, feel free to contact us at support@olironhealth.com—our team is always happy to help you find the perfect fit.






Jason M.
Does it roll up when you sit? Every compression shirt I've owned ends up around my ribs after an hour