After testing the NonEcho Sauna Vest for two weeks, I'm both impressed and slightly frustrated. The 10mm neoprene fabric truly delivers on its promise - I sweat buckets during workouts! Wearing it under a hoodie while doing chores made me feel like a walking furnace (in a good way).

The warmth is next-level. As someone who sleeps cold, slipping this on at night felt like being hugged by a toasty cloud. Surprisingly, it even helped my back pain - waking up after 8 hours without stiffness was magical.

BUT...that zipper is a nightmare. Like other reviewers mentioned, you need Jedi-level patience to align it perfectly. Mine started rusting after just three uses despite wearing an undershirt. The company really needs to upgrade this component.

Size-wise, go smaller than you think! I'm 6'1"/200lbs and the Large stretched out quickly. The Medium replacement fit much better initially but still rides up during intense movements.

Pro tip: Handwash only! Tossed mine in a gentle cycle once and the zipper completely detached (thankfully customer service sent a replacement). The chemical smell fades after a few washes if you air dry properly.

Final verdict? Great for sauna-like sweating and winter warmth, but flawed execution. If they fix the zipper issue, this would be a 5-star must-have.