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No Gut. No Man Boobs. No One Knows.
CoreLock™ | Feel The Power of Confidence, Shape & Control
CoreLock™ | Feel The Power of Confidence, Shape & Control
Crushes The Dad Bod
Flattens Man Boobs
Erases Love Handles
Invisible Under Any Shirt
Not shapewear. A men's compression undershirt that holds up your whole torso, not just squeezes your chest, so your gut's flat and your shirt hangs straight the second it's on.
UNTIL MIDNIGHT ONLY
🎁 FREE with every order: the Dad Bod To Fit Dad program ($100 value) + free shipping
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Sizing & Fit
Sizing & Fit
This tank is sized by body weight, not by shirt size. Find your weight in the size chart and order that size.
Width — don't go smaller
The instinct with a shaping tank is to size down for more hold. Don't. A tank that's too small can't flatten the middle, because the softness has nowhere to go — it grips above and below, pushes everything forward, and starts riding up within minutes. Tighter looks bigger. CoreLock™ does the holding, so the size on the chart is the size that works.
Length — go up if you're tall
Over 6'1", take one size up. That one is for length, not tightness. Weight sets how wide the tank is, not how far down it sits — a longer torso needs the longer cut so the hem stays put. Same if you carry most of your weight at the front: the hem has further to travel.
Checking against the chart
- Start with your body weight — that column decides the size
- To cross-check, measure around the fullest part of your chest
- Keep the tape level and snug — not pulled tight
- Measure over bare skin or a thin shirt, standing relaxed
If weight and chest disagree
Weight decides. The chest column is a cross-check, not a second answer. If your chest lands a size above your weight, take the larger one — broad through the chest and it will pull at the armholes otherwise. If your chest lands a size below, stay with your weight size. The middle is what this tank has to hold.
Landing between two sizes on the chart? Take the larger one.
Still not sure? Email support@selorna.com with your weight and height and our team will pick it for you.
Materials & Care
Materials & Care
CoreLock™ Compression Knit: 74% nylon, 26% spandex — more than double the stretch fibre of a standard compression tee, which is what lets it hold at true size instead of relying on being tight.
Zoned Construction: Firmer through the stomach, easier across the chest, so the middle is held without flattening everything above it.
Sleeveless Crew Cut: Full shoulder coverage and a flat neckline — no narrow straps digging in, and no outline printing through a shirt.
Nylon Frame: Nylon moves air and sweat instead of trapping heat, so it stays wearable under clothes for a full day.
Care
Machine wash cold on a gentle cycle. Do not bleach. Do not tumble dry. Do not iron. Hang to dry — heat is what breaks down stretch fibre, and stretch fibre is what makes this work.
Your 60-Day Trial
Your 60-Day Trial
Wear CoreLock every day for 60 days from the moment it lands on your doorstep, at work, at home, under real shirts. If your shirts don't hang flatter for any reason, send one email, send it back, and every penny lands back in your account. No forms, no fight.
60-DAY GUARANTEE
FREE SHIPPING
FREE BONUS PROGRAM
CoreLock™ | Feel The Power of Confidence, Shape & Control
The #1 Shaping Tank.117,482+ Men Strong.
Every buddies' trip ends with a photo on the 18th green. I used to hang back so my gut wouldn't show. Wore CoreLock under my polo this year and stood front and center, flat before I'd even lost a pound.
I kept my jacket buttoned through an entire client presentation so nobody would see the gut pulling at my shirt. Wore CoreLock underneath this time and unbuttoned it halfway through without a second thought. Still closed the deal.
I wore an oversized tee to every backyard BBQ just to hide the gut. Put CoreLock on under a plain tee this summer and actually tucked it in for the first time in years. My brother-in-law asked if I'd dropped weight already.
60 Days To Wear It, Every Penny Back If Not
Your Shirt Shouldn't Wait For The Diet To Work.
Bigger shirts. Darker colors. Untucking it and praying nobody looks twice. You're doing the work, the diet, the gym, the walks, but your gut isn't on your schedule. It's still showing up in every photo while you wait for the scale to catch up.
CoreLock's compression knit holds your whole torso flat right now, not just the chest, so your shirt hangs straight while the weight keeps coming off. 74% nylon, 26% spandex, more than double the stretch of a standard compression tee, doing the holding instead of you.
60 Days In Real Shirts, Every Penny Back
Hold It Up. Don't Just Squeeze The Chest.
Most compression shirts squeeze your chest hardest and give up at the stomach, so they ride up when you sit and roll into a rope, shoving your gut out underneath. CoreLock holds your belly, sides and back too, zoned firmer through the middle and easier across the chest, so nothing gets pushed down into a bulge.
It's the fabric doing the work at your true size, holding your whole torso instead of just clamping down on your chest. That's the difference you feel the second it's on.
60 Days At Your True Size, Every Penny Back
Nobody Can Tell. Not Even On A Hug.
The sleeveless crew cut means no straps digging into your shoulders, and the flat-finished hem leaves no thick band to print a line through a thin shirt. Feels and looks like a plain undershirt from the outside, even up close, even on a hug. Sized right, it doesn't roll up no matter how long the day runs.
Knitted on a nylon frame that moves air and sweat instead of trapping it, so it's cool enough for July and wearable all day under real clothes, from the first meeting to the last beer at the club.
60 Days, Every Shirt, Full Refund
Every Problem Area.Six Fixes.
Here's every spot that gives it away, and what changes the second CoreLock goes on.
60 Days To Test It, Full Refund If Not
Buy 3, Get 2 Free.Five Tanks, One Price.
Buy 3, Get 2 Free
Five CoreLock tanks means one for every workday, every polo, every dress shirt, with zero laundry scramble. Free shipping included, plus the free Dad Bod To Fit Dad program worth $100. Up to 70% off today only.
60 Days, Full Refund, No Fuss
What hiding it usually costs
WHY CORELOCK
- Hold-Up, Not Squeeze-In: flattens the whole torso
- Flattens man boobs, smooths love handles
- Breathes all day, invisible under any shirt
- Sleeveless crew cut, no straps, never rolls up
- Machine washable, S to 5XL, 110-463 lbs
Not Every UndershirtActually Holds.
60 Days To Compare, Full Refund
I'm 52, A 14 Handicap, And I Fit Men Every Day.
I'm Selorna's fit lead. I'm 52, I play off a 14 handicap, and I've got the same build as a lot of the guys buying this tank. I fit men every day, and the same thing keeps happening: a decent golf swing, and a polo that gaps at the button by the back nine.
So I started telling every guy the same thing: your shirt isn't the problem, what's under it is. I fit men into CoreLock every day, and nothing holds a soft middle flat like it does, or stays this comfortable this long. I wear mine on every round.
So try it with nothing on the line. Put CoreLock on every morning for 60 days straight. If it isn't holding things the way you hoped, for any reason, send one email, send it back, and you'll get every dollar back.
Mike Dawson, Fit Lead, Selorna
Everything You're Wondering
Is this shapewear?
No. Shapewear squeezes and digs in, guys call it a male corset. CoreLock is a men's compression undershirt, cut for a man's frame, built to hold your torso flat under real clothes, not pinch you into a smaller size for a few hours.
Can anyone tell I'm wearing it?
No. It looks and feels like a plain undershirt, even up close. Pass it the hug test: nobody will feel a seam, a strap or a line, they'll just notice you look flatter under your shirt.
Is it hot to wear?
No. It's knitted on a nylon frame that moves air and sweat instead of trapping it, so it's cool enough to wear under a dress shirt in July. You'll notice the hold long before you notice any heat.
What size should I order?
Order by your body weight: S to 5XL, covering 110 to 463 lbs. Always order your true size. Sizing down won't flatten anything, it'll just ride up. Over 6'1"? Take one size up for length.
Will it roll up during the day?
Not at the right size. The flat-finished hem has no thick band to roll, and it stays put on a correctly sized body through sitting, standing and everything between.
Will it flatten my chest and hold loose skin?
Yes to both. The zoned hold flattens the chest and smooths the "man boobs" look with the stomach. If you're losing weight, on Ozempic, Mounjaro or at the gym, and skin on your middle hasn't caught up, CoreLock holds it flat while your body keeps changing.
What if it doesn't work?
You get 60 days from delivery to wear it daily. If your shirts still don't hang flatter, for any reason, send one email, mail it back, and the full amount lands right back in your account.
Real Guys. Real Results.
I used to untuck my polo on every hole to hide the gut while I worked on losing it. Put CoreLock on before the round now and the buttons stay flat all 18 holes, straight through the club dinner after. My buddies noticed before I said a word.
I used to hide in the back row of every team photo while I worked on the gut. CoreLock goes on under my shirt before the game now, and I stand up front without thinking twice. My kids noticed I stopped slouching.
My dress shirts used to gap at the buttons by lunch, and I'd suck it in for every meeting. Now I put CoreLock on in the morning and forget about it until I take it off. The shirt just stays flat, sitting or standing, all day.
I'm down 60 pounds on Mounjaro and the scale's happy, but the skin on my middle didn't get the memo yet. CoreLock holds it flat under my shirt while my body keeps catching up. Nobody can tell what's doing the work.
I'm a big guy and every undershirt I've tried used to ride up by the back nine. Ordered the 4XL and it's the first one that stays tucked through the whole swing, the whole round, the 19th hole too.
I was dreading every photo at my daughter's wedding. Wore CoreLock under my dress shirt the whole reception and never once thought about my stomach. The pictures finally look like me on a good day.
At 6'3" I always come up short on undershirts. Ordered one size up like the chart says, and it covers everything with room to spare, no rolling up by the second meeting.
Bought the 3-pack and now I've got one in rotation every day: golf, work, weekend errands. It breathes enough that July doesn't change a thing. Machine wash cold, hang dry, ready again by morning.
60 Days, Full Refund If It's Not Right
Stop Waiting.Look Like It Now.
Join the 117,482+ men who already trust CoreLock under every shirt they own. Wear it every day for 60 days from delivery. If your shirts don't hang flatter for any reason, send one email, mail it back, and get every penny back. It's that simple.
60 Days, One Email, Full Refund