I returned this shirt, cause it was too tight for me, being a bit skinny fat. It is a great feeling, and a nice fit for yoga, when a shining tank top is real annoying. But you have to be ready to rock it in a real tight shirt. Not much difference in tightness between S and M, but the M is WAY longer. I am waiting on some "Perfect Tanks" from them, which allegedly are a little less revealing at the bottom. Bought them not from Amazon, but will update this review once I get them. Again, great tank, but you gotta be ready - either have a rad body or be A-OK with how you look wrapped real tight.Update: I purchased the "Perfect" tank instead, and they are, indeed, perfect. Still snug for reducing bunching and lifting during Yoga/exercise, but not quite so for fitting that they make even a slightly out of shape person look like a bag of potatoes. The material is SOO soft. So, these Sustain ones are great tanks if you're ripped or REAL snug is your jam. The Perfect line is a better option, in my opinion, for people that are of more average physique. It is still a comfortably snug fit - do not expect a typical floppy cotton tank.I can't say enough about the clothing line from 4-rth. Great material, fit and overall excellent line. The detailed stitching were an extra perk. I have several shorts and tanks. The tank is definitely a slim fit but feels great and never loose. I'm a Yoga teacher and live in my 4-rth shorts and tanks. The material is giving. I'm 6'1, 160lbs and slim - I use medium. Great fit / snug. I teach hot yoga so it's important my clothes don't stick or droop during specific postures. I will definitely purchase more from this company. The price is fine - like anyone, i always want to pay less for something great - but consider the junk out there like ll-lemon at twice the price, 4-rth has my business from now on.After years of searching and money spent, the mens yoga gear from 4 RTH hit the mark exactly for me. I teach and practice Hot Yoga and have always had to "make do" with swim suits or running shorts; what have you. While i'm far from a yoga fashionista, the sustain tanks, fusion shorts and cuffed yoga pants I recently ordered look great (excellent color choices), fit exceptionally well and work in any yoga posture. I'm 5'7'' and 135-140 lb. so I go w/ small and again the fit is spot on. If Doug and the folks from the company read this; thanks for the hand written note, don't change the current manufacture of these items and looking forward to new colors. The customer service and speed of delivery is flawless.Look forward to another order soon. My new go to yoga "uniform".Neckline is super low so it looks best on those with developed upper body strength, however it's still comfortable for scrawny guys like myself and wicks moisture away pretty well. Price point is a little high but the fabric is sturdy yet soft, feels like it will last quite a while.Great quality on the tank. It looks good on. We also purchased two of the men's pants. As expected, we needed to hem the long pair but that is much better than them being too short. Second pair of pants were cuffed and perfect.Husband is 5'8 broad shoulders and a 32 x32 size, 170#. Everything was a perfect fitted look for stage. If he was going to be using these for yoga class, a size up may have been more useful in the cuffed pants.These are very good quality comfortable tops, they feel a little big but I think the design is meant to be more open in the chest area than I'm use too.Snug fit without being washed and dryed yetVery good quality.I'm 5'11" and 190 lbs and this fit very well in a large - snug enough for yoga and to not slide over my head in down dog, etc.