I have a bad posture, so I bought it for improvement. I feel that the posture is corrected by putting it on the outside of the shoulder as much as possible. My armpits are tightened and it hurts, so I wear it from the top of my innerwear. I think that the habit of curling your back is rubbing against the belt that tries to stretch your shoulders, so if you consciously stretch your back, it will not hurt.
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I bought it for a family with rounded shoulders and a stoop. I am 174 cm tall and bought S size. I was able to put it on, but it feels like it bites into my armpits, so I wonder if the M size was better. It seems that the band hurts around the armpit, so I put it on my shirt. It seems that there is an effect because I started to care about my posture by wearing it. It's too hot to wear in summer.
Side and back alignment side, helps improve sitting, suitable for people who work in an office in front of a computer. Note that the sizes are large, even for thin women it does not fit even Small was wide on me.