I've had multiple shoulder separations/dislocations, had them surgically reconstructed twice, and recently dislocated/separated my shoulder again. Just walking around hurts and I can't hold more than about 5 lbs before my shoulder subluxates without a sling or brace. I've tried numerous braces and the SB03 is the brace to get if you've got shoulder dislocation, subluxation, separation, torn rotator cuff, and/or damaged ligaments & tendons as it provides effective support and preserves enough range of motion to still be functional. I find this brace significantly more comfortable and supportive than even a sling.The brace is constructed of neoprene and you will sweat if you are exerting yourself at all so I wear a t-shirt under it. I appreciate the adjustable arm closure: as other reviewers have stated - it might need readjusting if you are using arm muscles much or wearing it for long periods. The construction is much heavier duty than typical shoulder braces. The body/straps/x-brace are all made of heavy neoprene to which velcro will stick everywhere. The strap ends are all heavy duty velcro with rubber covers (the rubber covers are on the front and back sides of the chest strap closures and all four ends of the x-brace straps). The rubber covers are thick enough that you will notice them if you lean or lie against something firm. If you have shoulder pain/instability to appreciate this brace, you will look at any such discomfort from a hot brace with firm closures as a small price to pay for the joint support. If you've got two bad shoulders, it is possible to wear two of these braces - keep in mind that the overlapping chest straps would be akin to wearing an 8mm wet suit so your upper torso would be toasty and well supported.I'm borderline L/XL according to the size chart: around 6', 200lbs, with a 34" waist and a 43-44" chest measured around the ribs just under the pecs (usually wear a 44-46" jacket). I found the size Large to be just big enough, tight and supportive. I have the pecs of someone who benches a lot and the girls in my fitness classes regularly joke that I'm a A- cup size. You will find one side of the wide chest strap is firm across the chest (acting to flatten/pushup) and the other side has a triangle shaped cutout that your pec will stick out (providing firm support everywhere but the 'cup' area). If I was female with a larger cup size, I can't imagine something designed to provide more lopsided chest support and I'd likely invest in very supportive sports bras if I needed the relief of this shoulder brace. I've found the braces that have a single chest strap are not nearly as supportive but can usually go above the chest.The brace can be worn under dress clothes and is very supportive for manual labor, walking, running, biking, and weight lifting. It holds the shoulder firmly in the socket and still provides for some overhead motion. It is possible to play racquet sports, basketball, volleyball, and throw while wearing the brace but it does restrict motion somewhat. If you have enough shoulder pain/instability to require such a brace, you probably won't think it's too bad. I don't think you can find a brace that is supportive and completely unrestrictive but the x-strap is somewhat adjustable, enabling some tradeoffs in support and motion.Once adjusted, the brace can be slid up the arm, rolled over the shoulder, and put on/off using only the chest strap velcro closure. You may want to avoid tearing the velcro apart and instead gently peel it off to minimize wear on the hook/loop closures. One reviewer suggested flipping/reversing the chest strap closure to distribute wear and I think this is a good idea monthly. The neoprene gets sopping wet with exertion and I air-dry it daily and run it through the wash weekly on the gentle cycle in a mesh bag (to avoid it getting stuck to other clothing).This brace works well enough that I'm considering putting off another shoulder reconstruction despite my complete AC joint separation and continued issues with dislocation without the brace. Surgery has been very effective for me in the past, but the first few months of recovery from surgery are rough and it wasn't until about 12 months of really hard rehab that I started to enjoy the benefits of surgery. This brace allows a pretty active lifestyle and I'd even wear it at night if I had trouble sleeping on my back.The SB02 is the same brace but without the x-strap and is significantly less supportive, but with less restrictive motion - you can remove the x-strap from the SB03 so I don't think I'd buy the SB02 unless I needed a second brace for light support: perhaps sleeping or under dress clothes. The SB04 is the same as the SB03 but the x-strap has a padded hard shield. The hard plastic shield of the SB04 can provide firmer compression of the shoulder joint if you need more support than the SBO3 but your satisfaction with it will depend somewhat on the shape of your shoulder as the shield is not very flexible. I'd recommend the SB04 if your shoulder is sensitive to impacts and you are doing dirtbiking/motocross, bmx, mountain biking, horse riding, or some form of martial arts/contact sports. Otherwise you probably don't need the SB04 unless the SB03 isn't supportive enough for you. The SB05 is a double SB02 (to which you could add the x-strap from the SB03 or shielded X-strap from the SBO4). The SBO2/SB05/SB03 can be worn under football shoulder pads without too much discomfort (you might notice the rubber velcro covers more with shoulder pads over top of them, particularly the upper x-strap ends), but the shield on the SB04 would be like having an extra hard pad under the shoulder pads.It did help to stabilize the shoulder. My injury is a very old injury that turns out to be at the end of the bicep where it meets the shoulder affecting my throwing action with a baseball. I've been advised that it is a chronic condition I will have to live with. Overall I would say that the x-strap give me mobility and helps somewhat with discomfort. The thing I didn't like was how sweaty I got where the brace was.My son wears this during football games to prevent his shoulder from dislocating . We had to go up a size because the medium size was to tight on him and he only weighs 150 lbs. The large fits him well and allows him to breath easily while playing football . So far we haven’t had a shoulder injury all yea!!! Would definitely recommend it !!Waited to write this review to play tennis in it for several weeks. Conclusion -it’s outstanding in every way to support my shoulder until my labrum and rotator cuff surgery.During abduction for a big cut on my forehand and pronation during my serves, my arm was jello before and after any impact. My choice was to sit out my five days of tennis per week until my surgery 8 weeks from the tear or try this thing. Glad I did. Even showed my surgeon what I was using until he sees me on the operating table. He was intrigued.The compression of this thing feels good, solid, stable. The adjustable x strip offers even more support when I extend my arm to the side of my torso (abduction). The X strap keeps me from abducting too far causing more tearing.Because I’m a 6 feet tall woman with a 34C chest size, I was concerned the lay of the straps wouldn’t work because they would hurt across the breast or because the rib cage strapping wouldn’t be flush. Wrong.So glad the thick bands rest well enough across my support bra (already compressing me) and nicely around my rib cage. Just note - I did have to size up from the M to the L most likely to accommodate the exercise bra/breasts. Glad I did because I can pull the rib cage strapping even tighter.The Velcro on this device is super strong. It sticks so well, I feel like I’m ripping the brace itself apart when I’m separating it. I’m not. It’s just built well and sticky. Just make sure you align the Velcro perfectly on the device. If you don’t and you’re wearing it under your shirt like I do, the Velcro scratches. I just re align. I’m guessing you men would be unequivocally satisfied with the fit of this with minimal adjustments or considerations on your pecs. Give this a try. It’s worth it.I wish EVS made a device designed specifically for women where the front part opening intentionally accommodated breast. Not a complaint. Just a suggestion. I’m supremely satisfied I’m still playing tennis -despite the 3 painful tears - until my operation.Granted, it does not fit like a customized brace would. The arm sleeve bunches a bit when I extend the X strap to fit tighter and there is the occasional pucker along the armpit. That said, it’s doing a great job for a generic support device.I play college softball and purchased this to help keep stability. I had a slap tear and this really helped me. I since have had surgery, but I have been advised to keep wearing it after I am cleared. You best bet I will be wearing it after I am cleared.Bought this brace to support a recurrent dislocating shoulder. Cant comment on its support as the sizing isn't very good. I chose the Large size as it is supposed to fit between 40 and 44" chest. My chest measured was 43", however the brace was too small, and would not sit properly around my shoulder. I'd suggest if you're buying I'd select the next size up.As a side point to note the vendor is Windsor Store is in America, postage cost to return was over £20 - so beware!just what i wantedI had knee braces for years usually after recurrence of an injury. Then decided to wear them all the time, and found the pain from injury and arthritis disappeared and I no longer required medication. I severed a rotor cuff muscle in my shoulder some years ago and for months the pain was excruciating, especially at night. The remaining 3 muscles eventually took over. Lately if I overdid it, the pain returned at night. So tried another shoulder brace that created more pain than it relieved. Then decided on this one. Sizing says 40 - 44 inches is large, I am 40. Usually order X Large but ordered Large. Way too small send it back and re-ordered X Large. Fits perfect, wear it every day, no pain and no pain at night. Definitely impressed!!My husband has had multiple shoulder surgeries and is currently waiting for another. This brace has been a huge help for him as he is unable to carry his own arm weight anymore. We had a minor issue with a velcro fastener that came aprt but Amazon immediately replaced with a brand new brace and we have had no issues with the new one. I would recommend to anyone requiring this type of brace. The size chart was accurate as well.Love the brace works great, one thing to note is to buy one size bigger, in my case I have a 38 inch chest and small biceps, I originally ordered a medium and it cute off circulation in my arm and was to tight around my chest, I returned it and purchased large and it is a near perfect fit. has helped support my shoulder, and very comfortable to wear.