They’re made from mesh nylon fabric. Product details commonly list an 80% nylon / 20% spandex blend.
Most are described as slim fit. Neckline options include scoop neck for muscle-tank styles and crew neck for sleeveless crew styles.
Sizes are typically offered from X-Small through 3X-Large. Listings also note availability in Big and Tall men's shapewear sizes.
The tanks are made from full power-mesh fabric designed for ample airflow and breathability; the mesh construction is also described as quick-drying.
Comfort features include flatlock seams to minimize chafing. Some listings note unlined or single-layer construction for a lighter feel.
They’re described as below-waist length (listed in product details as “Length: Below Waist”).
They can be worn as an undershirt for shaping or worn alone as an active or sporty outer layer.
Listings recommend choosing your usual street-clothing size, but first-time compression wearers may prefer ordering one size larger to avoid excessive tightness. A simple check suggested in some listings is that you should be able to slide your hand under the garment without strain.