I've been using the MERMAID'S MYSTERY Waist Trimmer for about a month now, and I have some thoughts to share. First off, the neoprene material is thick and high-quality - you can immediately tell it's not some cheap Amazon knockoff. When I first put it on, I was surprised by how quickly it made me sweat during my workouts. Like, dripping sweat after just 10 minutes on the elliptical.

The hourglass shaping is no joke either. The side straps really cinch you in, though fair warning - the first few wears can feel uncomfortably tight until you break it in. I made the mistake of wearing it too tight during a HIIT class and had to loosen it mid-workout.

Where this product really shines is back support. As someone who sits at a desk all day, I've noticed significantly less lower back pain when wearing this. The four flexible bones provide legit support without being restrictive.

Now for the downsides: It's bulkier than expected (not exactly discreet under clothes) and runs large - I'd recommend sizing down. Also, that strong Velcro? It will absolutely scratch your skin if not positioned carefully.

After consistent use, I've seen about an inch reduction in my waist measurement (combined with diet/exercise). Is it magic? No. But does it enhance workouts and provide great support? Absolutely worth the $30-$40 price tag.