WARNING LETTER
Trans-Missie B.V.
MARCS-CMS 720852 —
December 16, 2025
Delivery Method:
VIA Electronic Mail
Product:
Medical Devices
Recipient:
Recipient Name
Danaë Kurvers
Recipient Title
Owner
Trans-Missie B.V.
Visseringweg 3A
1112AS
Diemen
Netherlands
abuse@untag.com
Issuing Office:
Center for Devices and Radiological Health
United States
Secondary Issuing Offices
United States
WARNING LETTER
CMS #720852
December 16, 2025
Dear Danaë Kurvers:
The United States Food and Drug Administration (FDA) has reviewed Trans-Missie B.V. d/b/a UNTAG’s (“your firm”) website (untag.com) and observed that your website offers various breast binders for sale. Under section 201(h) of the Federal Food, Drug, and Cosmetic Act (the Act), 21 U.S.C. § 321(h), these products are devices because they are intended for use in the diagnosis of disease or other conditions or in the cure, mitigation, treatment, or prevention of disease, or to affect the structure or any function of the body.
Our review of your firm’s website revealed statements that these breast binders (example trade names: “Short Binder black”, “Short Binder – Extra Strong black”, “Gym Binder – Extra strong black”, “Short Binder beige”, “Short Binder – Extra Strong Beige”, “Tank Binder”, “Shirt Binder beige”) are intended for use in the diagnosis of disease or other conditions, or in the cure, mitigation, treatment, or prevention of disease, or intended to affect the structure or any function of the body, including:
•    Per your firm’s website: “A binder works by pressing the breasts flat against the chest, spreading the mass of the breasts. This makes the breasts appear flatter and less present, which can help reduce gender dysphoria or any other uncomfortable feelings that you might have about your chest.”
•    Per your firm’s website: “Most people wear a binder because it helps reduce any gender dysphoria that they experience about their breasts. Binders can be worn by … people who have just had breast surgery, people who suffer from gender dysphoria.”
•    Per your firm’s website: “A binder can greatly help to reduce body dysphoria and promote gender euphoria”
•    Per your firm’s website: “Reduced dysphoria: Binding alleviates the distress associated with a chest that does not align with one’s gender identity…Improved mental health: Participants in multiple studies reported reduced anxiety and depression, increased confidence, and greater comfort in public spaces”
•    Per your firm’s website: “Gender affirming garments can help you alleviate gender dysphoria by compressing or enhancing body parts that cause you negative feelings. As you can imagine, some of these gender affirming practices (like wearing binders) are not entirely without risk.”
Our review also revealed statements that you manufacture these devices within the meaning of section 510 of the Act (21 U.S.C. § 360) (e.g., “UNTAG products are designed and engineered in Diemen - Amsterdam.”). Under section 510 of the Act (21 U.S.C. § 360), manufacturers of medical devices are required to annually register with the FDA.  In September 2007, section 510 of the Act was amended by the Food and Drug Administration Amendments Act of 2007 (Pub. L. 110-85) to require domestic and foreign device establishments to submit their annual establishment registration and device listing information to FDA by electronic means [section 510(p) of the Act (21 U.S.C. § 360(p))] during the period beginning October 1st and ending December 31st of each year.  Our records indicate that you have not registered or listed these devices for fiscal year 2026.
Therefore the devices are misbranded within the meaning of section 502(o) of the Act (21 U.S.C. § 352(0)), in that they were manufactured, prepared, propagated, compounded, or processed in an establishment not duly registered under section 510 of the Act (21 U.S.C. § 360) and were not included in a list required by section 510(j) of the Act (21 U.S.C. § 360(j)).
Your firm should take prompt action to address any violations identified in this letter.  Failure to adequately address this matter may result in regulatory action being initiated by the FDA without further notice.  These actions include, but are not limited to, seizure and injunction.
Other federal agencies may take your compliance with the FD&C Act and its implementing regulations into account when considering the award of federal contracts.
Please notify this office in writing within fifteen business days from the date you receive this letter of the specific steps your firm has taken to address the noted violations, including an explanation of how your firm plans to prevent these violations, or similar violations, from occurring again.  Include documentation of the corrections and/or corrective action (which must address systemic problems) that your firm has taken.  If your firm’s planned corrections and/or corrective actions will occur over time, please include a timetable for implementation of those activities.  If corrections and/or corrective actions cannot be completed within fifteen business days, state the reason for the delay and the time within which these activities will be completed.  Please provide a translation of documentation not in English to facilitate our review.  We will notify you regarding the adequacy of your firm’s response(s) and the need to re-inspect your firm’s facility to verify that the appropriate corrections and/or corrective actions have been made. If you believe that your products are not in violation of the FD&C Act, include your reasoning and any supporting information for our consideration as part of your response.
Your firm’s response should be sent via email to CDRHEnforcement@fda.hhs.gov. Please include in the subject line, “CMS 720852” when replying.
Finally, you should know that this letter is not intended to be an all-inclusive list of the violations at your firm’s facility.  It is your firm’s responsibility to ensure compliance with applicable laws and regulations administered by FDA.  Your firm should investigate and determine the causes of any violations and take prompt actions to address any violations and bring the products into compliance.
Sincerely yours,
/s/
Michael J. Hoffmann
Director
Office of Health Technology 3 - Gastrorenal, ObGyn,
General Hospital, and Urology Devices
Office of Product Evaluation and Quality
Center for Devices and Radiological Health
Food and Drug Administration
cc: Shopify, Inc.
abuse@shopify.com
cc: service@untag.com
Content current as of:
12/16/2025
Regulated Product(s)
Medical Devices