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Description
Locally Made Sport Binder EXTRA STRONG by UNTAGUNTAG's Sport Binder Extra Strong is modeled after their regular Gym Binder but has binding on the back as well as the front. The Extra Strong version is recommended for larger cup sizes, but not recommended as your first binder. The Gym cut allows for extra mobility around the arms, has a lower cut in the back to prevent excessive perspiration, and is a few centimeters shorter on the stomach than the Short Binder. Binders are tight chest garments
UNTAG's Sport Binder Extra Strong is modeled after their regular Gym Binder but has binding on the back as well as the front. The Extra Strong version is recommended for larger cup sizes, but not recommended as your first binder.
The Gym cut allows for extra mobility around the arms, has a lower cut in the back to prevent excessive perspiration, and is a few centimeters shorter on the stomach than the Short Binder.
Binders are tight chest garments used to flatten the appearance of breast tissue in order to achieve a more masculine gender presentation. They can be worn by any person and come in a variety of shapes and materials.
UNTAG (formerly known as Trans-Missie) has been specializing in chest binders and other FTM (female-to-male), MTF (male-to-female), genderqueer, and nonbinary clothing accessories for 19 years. They are a small company that makes everything by hand in their studio in Diemen, Netherlands, and use sustainable fabrics made in Germany.
Material: 58% polyamide and 42% elastane.
Care instructions: Wash at 30 degrees C, preferably in a laundry bag. Not suitable for the dryer.
Sizing Guide:
You may also schedule a time to come to our showroom in Rotterdam to try them on before you buy to make sure you have the best fit for you <3.
How do you measure your size?
- Wear tight clothing. If you’re wearing layers of clothing the size you measure won’t be accurate.
- Be aware of push up and/or filled bras, as well as tight belts.
- Most measuring tapes have numbers on both sides (cms and inches), make sure you’re reading the right side of the tape.
How do I determine which size and model is best for me?
- A firm breast is more difficult to camouflage than a sagging breast. If you have a firm breast, we recommend our extra strong material.
- If there's a big difference between the circumference of your chest and the circumference of your waist (your waist is much smaller than your chest), choose the size according to your waist size, not your chest’s.
- Large breasts are more easily camouflaged in a singlet than in a short top because there simply is more room to divide them.
- If you are in between sizes, we encourage you to consider your shoulder measurements; if you have broader shoulders, definitely go with the larger size.
- Do not intentionally go down in size; you will not be able to put the binder on.
- Binders are meant to be tight, like a second skin. You should be able to breathe and the material should not be cutting into your skin.
- If your sizes are not in the chart, it is still possible to get a garment made to measure. Fill out your sizes in the size form while ordering the item and we will make it and send it within 3 workdays.
- If you have any questions about sizing, please let us know! We are happy to give you some advice.
Size Chart - see photo
Returns and exchanges
How To get into your binder:
Model Info:
Lo wears the Gym Binder - Extra Strong in size 170/176, in the color black. Lo has a bust of 82 cm, an underbust of 67 cm, and a waist of 58 cm.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.9 ★★★★★
Based on 979 reviews
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Product Reviews
★★★★★ 1
Broke easily
Color: Blue
Not for agressive chewers
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Reviewed in the United States on June 3, 2026
★★★★★ 4
Durable But Quirky Interactive Ball
Color: Blue
I am 30 now and my tolerance for toys that break in 2 minutes is basically zero. I picked this up during a weekend DIY project when I was fixing the deck and needed something to keep the dog occupied. The E TPU material is straight up impressiveuch abuse it can take from a large breed. My dog tends to destroy generic store brand balls but this one survived being dropped down the stairs and tossed against the siding. It is comfortable enough to use daily without feeling like it is going to shatter or hurt the dog.
The internal compartment where you charge it is smart and those little pockets for the charging port are actually useful sized for my fat fingers. The smart movement is a game changer for keeping a high energy dog moving when I am busy with home improvement tasks. I was slightly worried about the 8 hour battery life but it holds a charge well enough for a few play sessions. My whole household uses this now to entertain the dog as he will not leave us alone otherwise. It works best on my kitchen tiles but it barely moves on the thick rug in the living room which is frustrating.
The vibration is loud enough to be annoying when I am trying to focus on work. It is a solid 3 star product as it does what it says but has some quirks that make it less than perfect. Spending 19.99 is fair for the durability you get compared to cheaper options. I like that it is USB rechargeable instead of eating through batteries. It is not perfect but it serves a purpose in my chaotic house.
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Reviewed in the United States on March 28, 2026
★★★★★ 5
Engaging and Durable: High-Energy Play with a Caveat for Sensitive Pups
Color: Blue, Color: Blue
Finding an automated toy that can survive the jaws of an aggressive chewer while keeping them physically engaged is a major win for busy pet owners. This smart interactive dog toy offers an excellent, high-tech way to keep high-energy dogs active, though its enthusiastic movement might be a bit intense for more timid pets.
Dynamic and Instinct-Triggering Movement: The core appeal of this toy is its smart interactive movement. This automatic bouncing ball activates immediately upon touch, rolling and bouncing in entirely unpredictable directions. This erratic motion successfully triggers a dog's natural chasing instincts, keeping them thoroughly engaged and entertained for hours, which is incredibly helpful when you are unavailable to play. However, because the movement is so sudden and dynamic, it can occasionally scare more sensitive or easily startled dogs.
Chew-Proof and Safe Construction: The durability and structural safety of the ball are highly impressive:
*Chew-Proof E-TPU: Crafted with a high-density E-TPU shell, the toy is specifically built to withstand aggressive chewing and rough play from medium to large breeds. It holds up remarkably well against scratches and deep bites for long-lasting use.
*Pet-Friendly Materials: The non-toxic, BPA-free material is completely safe and remains gentle on your dog's teeth and gums during fetch or heavy chewing sessions.
*Injure-Free Design: The toy is engineered with smooth, rounded edges to prevent any accidental cuts or injuries during high-speed play.
Supporting an Active Lifestyle: This toy serves as a fantastic tool for supporting an active lifestyle. It encourages vital daily exercise to help maintain your dog's physical health, significantly reduces boredom, and curbs destructive behaviors like furniture chewing. This makes it an absolute lifesaver for high-energy pups that need a constant physical outlet.
Convenient USB Rechargeability: Powering the toy is simple and environmentally friendly. It is equipped with a USB rechargeable battery that delivers up to 8 hours of continuous play on a single charge. It also includes the necessary USB charging cable, ensuring you can quickly plug it in and have it ready for the next play session without constantly buying disposable batteries.
Bottom Line: I highly recommend this smart interactive dog toy for owners of high-energy, medium-to-large breeds that need an indestructible, engaging outlet. While it may frighten more timid or anxious dogs due to its unpredictable bouncing, its premium E-TPU durability, great battery life, and excellent exercise value make it a fantastic investment for a healthier, happier pet.
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Reviewed in the United States on May 27, 2026
★★★★★ 5
Ymswznwe Smart Interactive Dog Toy, Pet Automatic Moving Bouncing Ball, Chew-Proof
Color: Blue, Color: Blue
This toy has been so much fun to watch my dogs interact with. I love the randomness of the movements because it keeps them guessing and keeps the toy interesting instead of becoming predictable after five minutes.
They definitely weren’t sure what to think of it at first, but once they figured it out, it became hilarious entertainment. One of my dogs especially likes to hold it in his mouth and just let it vibrate, which cracks me up every time.
I think toys like this are great not only for physical activity, but also for mental stimulation and curiosity. It gets them engaged in a different way than a regular ball or chew toy.
While I wouldn’t consider my dogs “power chewers,” toys usually do not last long around here, so I was pleasantly surprised by how well this has held up. At the time of this review, it still looks basically brand new, so it is pretty durable.
I also really appreciate that it’s rechargeable. I’m glad I’m not constantly going through batteries with a toy like this.
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Reviewed in the United States on May 11, 2026
★★★★★ 2
Interesting Premise
Color: Blue, Color: Blue
It's an interesting premise for a toy -- it has a vibrating gyrator in the middle which turns on randomly for random durations. This then causes the ball to vibrate and roll around the floor. It really needs to be on a hardwood floor to move, though -- when I put it on their dog bed, it vibrates but then doesn't move anywhere.
I tried a few times to get my four dogs to interact this this ball toy, but they are clearly not interested.
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Reviewed in the United States on March 20, 2026