Sure ... he purchased it on Amazon and I believe this is the one.

https://www.amazon.com/Corrector-Clavicle-Adjustable-Straightener-Providing/dp/B07L41CV8B/ref=mp_s_a_1_3?dchild=1&keywords=figure+8+shoulder+brace+for+adults&qid=1604921818&sprefix=figure+8+shoulder&sr=8-3

As mentioned, he wears it for a very short time (per the instructions) to get a feeling of proper posture. Of course it needs to be followed up and sustained by daily practice when not wearing it (& therein lies the challenge)

Best