- Extreme! Chest Only Compression! Relaxed Mid-Section. Extreme Chest Concealer Tank. Inside a regular looking cotton spandex tank top are double reinforced powernet panels of 30% Spandex and 70% Nylon. But these panels are only present on the chest and the upper back leaving your mid-section with minimal compression and very relaxed. This is the perfect solution for one looking for very strong chest binding without discomfort of tummy compression. Made in the U.S.A.