Let me start by saying this neoprene shaper shirt is NO JOKE when it comes to making you sweat. I wore it during my usual 30-minute HIIT session, and within minutes, I was dripping like I'd run a marathon. The heat retention is intense - you can literally feel your core temperature rising.

The material feels durable (70% neoprene blend), though some reviewers mentioned tearing issues. Mine held up fine through multiple washes, but the armpit seams are indeed thick and can chafe if you're not careful. Pro tip: wear a thin tank underneath if you're sensitive.

Now the BIG caveat: sizing is WILDLY inconsistent. I'm typically a medium but had to size up twice (!) to get a comfortable fit that still provided compression. Several reviewers with larger busts (34DDD+) noted the zipper tends to slide down - I experienced this too and had to use a safety pin hack.

The chemical smell out of the package is strong (common with neoprene), but faded after two washes. It's definitely not lounge-around-the-house comfortable - this is strictly for workouts where you want maximum sweat output.

Bottom line: If you need serious sweat induction and don't mind playing sizing roulette, it delivers on thermogenic effects. But for everyday wear or if you're between sizes, consider other options.