The armor is good for elbows and knees but it is NOT shoulder armor. It is too big for most jacket shoulder bags. I ordered two sets, the second one has to be returned. Scorpion Armor SasTec Shoulder 1pc Black 9103-03 is what you need for your shoulders. Luckily I didn't have to test it for impact resistance but I can say it forms well in a jacket. It felt stiff at first but it fits and is comfortable. I'm currently using them in a Roland Sands Walker jacket.
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