Medium Compression

Define Vest Duo - Black


Want some coverage on your midsection, back, and underarms? Define Vest Duo covers ALL those sections, bringing you the best coverage you can have for a waist trainer. This unisex workout garment is ALSO perfect for anyone; equipped with our well-known SweatTech™ technology, our Define Vest Duo also provides extra and versatile compression that can be adjusted and reduced whenever.

  • Latex and cotton composition   
  • SweatTech™ technology   
  • Two removable velcro compression straps   
  • Zipper fastening   
  • Sweat-wicking   
  • Back support   

If you still have questions about our products and services, check out this page or follow us on Instagram @WhatWaistOfficial.

Available in sizes XS-8XL. Use our size quiz above, which has a 98% accuracy rating, to find your perfect fit. If you still have questions about your size, please read our Size Guide.

High Compression

Proven to get faster results during workouts with our science-backed, SweatTech™ technology which: boosts sweat production and provides support and compression while increasing intensity.


Latex and cotton composition   - these materials combined give you the compression and the durability you need for a waist trainer. 
SweatTech™ technology   - one of our pioneer technologies, SweatTech combines latex with curved metal rods to produce excess warmth and get rid of excess water weight and toxins. 
Two removable velcro compression straps   - easy to remove, peel and stick straps for convenient adjustment. 
Zipper fastening – this garment also has zipper fasteners for reliability and fastening convenience. 
Sweat-wicking – who likes sweat in their clothing? This garment moves the sweat to the fabric’s outer surface so you can dry easily and feel more comfortable 
Back support – get that poise well-maintained with back support added to this cincher 

An hourglass-shaped figure – that's our goal of finding the best waist trainers out there. However, most of the waist trainers out there lack two things: coverage and adjustability. And who has time to research for those? Good thing you’re looking at the answer now: our Define Vest Duo covers both, and not only that; it'll also define your shape and get that hourglass figure you’ve been aiming for. 

Features our specially designed, sweat-wicking latex exterior, cotton interior, a zipper-fastener, and a velcro compression strap that adjusts as your waistline reduces.

Inside: 96% Cotton, 4% Spandex Outside: 100% Latex

To maintain the quality and strength of the materials, we recommend hand washing this item with mild soap in warm water. Air dry garment by hanging or lay flat to dry. Do not bleach, do not iron.

Buy It With

Vapor Define Band

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Product Comparison


Define Band
Wonder Waist Band
MT VaporTech™ Sweatband
Define Vest Duo
Vapor Define Band
Full Body Sauna Suit
Known For:

 "Most Popular"

 "Most Comfortable"

 "Best For Working Out"

"Full Coverage" 

 "Most Innovative"

 "Most Coverage"



Medium light

Light Adjustable



Medium / Light


Workouts / Shapewear

Workouts / Shapewear


Workouts / Shapewear

Workouts / Shapewear


Target Area

Abdomen, Back, & Obliques

Abdomen, Back, & Obliques

Abdomen, Back, & Obliques

Abdomen, Upper back, Under Arms

Abdomen, Back, & Obliques

Abdomen, Upper back, Under Arms, Hips, Thighs

Body types

All Body Types, Long Torso

All Body Types, Short Torso

All Body Types

All Body Types

All Body Types, Long Torso

All Body Types, Plus Sized