

🩲 Slip into smooth confidence — undie-tectable, unstoppable.
The Spanx Women's Undie-Tectable Trouser thong offers lightweight, all-day shaping with a bonded waistband and elastic-free edges to eliminate visible panty lines. Crafted with a breathable, quick-drying cotton gusset, it delivers comfort and discreet smoothing support for your tummy and bottom. Designed for a flawless fit and seamless wear, this thong is perfect for professional millennials seeking subtle confidence under any outfit.









| Care instructions | Machine Wash |
| Country of origin | China |
| Material composition | 78% Polyamide, 22% Elastane |
H**E
Looked minuscule but stretched!
I LOVE them! I ordered a proper rib-to-thigh one but I’ve never worn it. It’s such a struggle just at home and to wear it out I feel would be a nightmare - trying to get out of it in time for a wee! These however are great. I gained weight in lockdown and my hips are out of control. These just pull them in and smooth over my tummy to make a tight dress/ skirt look better. One thing I’ve noticed is that if I sit down in them too long they make my buttcrack sore.. but that could just be me lol! Am gonna get some more. Am a uk10 with uk12 hips/ bum and I ordered a small. They stretch!!
N**L
Good product but came dirty.
Product itself is great for no appearance under wedding dress but it came from Amazon covered in small black scuffs
B**E
Mummy tummy heaven!
Arrived today and I’m surprised at how effective they are! I’m a UK size 10 (US 6) and have a bit of a mummy tummy, so went for the 36. I’ve tried other shapewear and it always seems to concentrate on the upper part of the tummy, pushing everything down. But this targets the lower tummy perfectly! No muffin top. And the thong aspect really boosts my (usually not that impressive) bum. Perfect for leggings, my hubby’s not been able to keep his hands off me all afternoon! Defo buying more!
M**S
Not like previous Spanx
Comfortable but not like previous Spanx where i’ve literally needed a shoe horn to get them on, fabric softer & defo not tighter.
C**S
Good
Good product, do their job but don't expect them to hold as much as other spanx. They give you just that little help, exactly what I needed.
A**R
Lovely
My favourite suck me ins that I’ve bought
B**D
Top rolls down
Not a good fit on me. I’m petite size 8-10 and wanted to flatten my mum-tum. These did but created a mini muffin at the top, cutting me off just above the belly button. And when I sat down the top rolled down. Not streamline for me. Attractive looking though, as shapewear pants go. Just not for me. I found the Werena pair far better, they come higher and don’t roll. (And much cheaper!)
I**E
feel very comfortable for a g-string if you see what I mean
Undetectable, feel very comfortable for a g-string if you see what I mean :) so I was impressed on that. The band fits high (but I am short torso) so looks great with all my high waisted trousers. The material is nice and thick so will retain its shape well after many washes. The sizing though is super small. I had to exchange xs for small somewhere else.
Trustpilot
4 days ago
1 month ago