I’m 5’7 170 pounds 34” waist. What size do you recommend?

HI. I'm 5'6 1/2 189 pounds 38" waist. I purchased the XL size. At the tightest adjustment, it's OK. I should have purchased the Large. To answer your question, in your case, I'd go with the MEDIUM. You'll love it! It changes your body shape and turns you into a stud. I'm 69 years old and It takes care of my "moobs".

Th e reviews are confusing. Some many say choose a size up with some saying choose a size down. Which is it? Im 5'10 212lbs.

I'm 5'11", 195 lb. Mine is a 2XL. There are three lines of adjustments (eye hooks). I have mine set at the tightest adjustment level. It snug but not uncomfortable at all. If there was one more tighter level I might have tried it but at this level it does the job for me. I especially like the back support I need & get from using it. I think for your 210lb & 5'10" height the 2XL would be perfect.

5/8 inches 290 lbs 3xl shirts, what size do you recommend me getting?

If you wear 3X-L shirts, you should try the 3X-L vest. The fit really depends on your body shape. It's a compression vest, so obviously it's going to be a very, very uncomfortably tight fit -- especially if you have a belly. But, a tight fit is the point . . . pull everything in and keep it tightened down. I will say, this "mirdle" features an intricate, multi-tiered, 15-hook and eye closure panel that allows you to make some small adjustments in the fit.

Im 5'10" 305 built like 260 what size should I get?

Honestly you're going to want to get the 3xl. If it's too small it will rise up on you. What inkenanit will start to go up as you move around and you'll keep readjusting it if it's not the right size.