Flexvibe brushed fabric shapewear in Core Color, smooth support main product image

Flexvibe Sweat-Inducing Thermal Tank Top | Heat-Locking, Waist Shaping, Zipper & Pullover, 2 Colors, S–4XL

Name: Flexvibe Sweat-Inducing Thermal Tank Top | Heat-Locking, Waist Shaping, Zipper & Pullover, 2 Colors, S–4XL
Rating: 4.75 (8 reviews)

Smooth shapewear layering with a gently held-in feel under dresses, workwear, and everyday outfits.

$26.00

Buy 2 get 10% off - code FV10

ColorBlue core Blue core Silver core

Type Zipper Style Pullover Style

Size S M L XL 2XL 3XL 4XL

Find your fit

Size Guide

All measurements are body measurements in inches. If you are between sizes, choose the larger size for a more relaxed feel or the smaller size for a more held-in fit.

Maternity & Postpartum

Size	US	Bust	Under-bump Waist	Hip
S	4-6	34-36	29-31	36-38
M	8-10	37-39	32-34	39-41
L	12-14	40-42	35-38	42-45
XL	16	43-45	39-42	46-49
XXL	18	46-48	43-46	50-53

Start with your pre-pregnancy size, then size up when you want more room through the bump, belly, or hips.

Flexvibe Sweat-Inducing Thermal Tank Top | Heat-Locking, Waist Shaping, Zipper & Pullover, 2 Colors, S–4XL

How To Measure

Measurements should be taken directly on your body.

Bust: Measure around the fullest part of your bust, keeping the tape level.

Under-bump Waist: Measure around the lower belly where maternity waistbands usually sit.

Hips: With feet together, measure around the widest part of your hips.

See more on our Size Guide.

Free Shipping over $30

30-Day Returns

The Flexvibe Sweat-Inducing Thermal Tank Top is a dual-layer sauna tank top with a heat-locking polyurethane inner layer and a breathable polyester outer layer, designed to maximize sweat output during gym workouts and daily wear while providing waist shaping and tummy control. Available in Zipper Style and Pullover Style, in Blue Core and Silver Core colorways, S–4XL — making it one of the most versatile sweat-enhancing shapewear tops for active women.

Quick Fit Snapshot

Best for gym workouts, sauna sessions, and sweat-enhancing daily wear
Inner layer 100% Polyurethane (PU) — heat-locking sweat-inducing
Outer layer 90% Polyester + 10% Elastane — breathable, flexible
Styles Zipper Style & Pullover Style
Sizes S, M, L, XL, 2XL, 3XL, 4XL · Blue Core, Silver Core

Sauna ShapewearSweat-InducingGymHeat-LockingWaist ShapingDual-Layer

✓ PU heat-locking inner layer✓ Waist shaping tummy control✓ Zipper & pullover styles✓ S–4XL inclusive sizing

Product Features

Heat-Locking Dual-Layer Construction

Inner layer: 100% Polyurethane (PU) — traps body heat to maximize sweat output during workouts
Outer layer: 90% Polyester + 10% Elastane — breathable, flexible outer shell for comfortable wear
Waist shaping — cinches and defines the waist during workouts for a more sculpted appearance
Tummy control — provides gentle abdominal compression during gym sessions and daily wear

Zipper & Pullover Styles

Zipper Style — easy on/off with adjustable ventilation during workouts
Pullover Style — streamlined, minimal design for a clean gym look
2 colorways, S–4XL — Blue Core, Silver Core

Size Guide

Available in S, M, L, XL, 2XL, 3XL, 4XL. True to size. Size up if between sizes for comfortable active wear fit.
View Full Size Guide →

Care Instructions

Machine wash cold on gentle cycle
Do not bleach
Hang or lay flat to dry — do not tumble dry
Do not iron the PU inner layer

FAQ

How does a sweat-inducing sauna tank top work?

A sweat-inducing sauna tank top uses a heat-locking inner layer, typically made from polyurethane (PU), that traps body heat against the skin during exercise. This raises the local skin temperature, causing the body to sweat more in the covered area. The increased sweat output can help with temporary water weight loss and may enhance the feeling of a more intense workout. Results are temporary and primarily reflect water loss rather than fat loss.

Is a sauna tank top safe to wear during workouts?

Yes, when used responsibly. Stay well-hydrated during workouts while wearing a sauna tank top, as increased sweating can lead to dehydration. Start with shorter workout sessions to allow your body to adjust, and remove the garment if you feel overheated or uncomfortable. Avoid wearing sauna shapewear in hot or humid environments where overheating is a risk.

What is the difference between the zipper and pullover sauna tank top styles?

The zipper style features a front zipper that allows easy on/off and adjustable ventilation during workouts — you can partially unzip to cool down without removing the garment. The pullover style has a streamlined, minimal design without a zipper for a cleaner gym look and slightly more consistent heat retention. Both styles provide the same heat-locking and waist-shaping benefits.

What is this tank made from?

The inner layer is 100% polyurethane for heat-locking sweat induction, and the outer layer is 90% polyester with 10% elastane for breathability and flex.

What sizes and styles are available?

Zipper and pullover styles, in S through 4XL, in Blue Core and Silver Core.

How should I wash this tank?

Machine wash cold on a gentle cycle. Do not bleach. Hang or lay flat to dry, do not tumble dry. Do not iron the PU layer.

Shipping
Free standard shipping on orders over $30. Most orders process in 1-2 business days and arrive in 7-10 business days.

Returns
Return unworn, unwashed items with tags and original packaging within 30 days.

Fit Snapshot

Smoothing fit & size

Shapewear fit notes for visual smoothing, coverage, comfort, and measurement-based sizing.

Fit & size

Do not size down. Use real waist, hip, bust, and torso measurements so the piece can smooth without rolling or digging.

Fabric & coverage

Review the product description and photos for fabric composition, stretch, lining, padding, pockets, opacity, and care. For lighter colors, check photo coverage before choosing underwear color.

Before checkout

Confirm the Size Guide, shipping timing, and return policy. Flexvibe describes fit, support, and visual smoothing only; we do not promise weight loss, body changes, or medical results.

Size Guide Sports Bras Shapewear