This is an Indulgence Scapular
"And let it be remembered, besides any particular indulgences, there are granted to the scapular of the Immaculate Conception, all indulgences granted to any religious order. And particularly (while wearing the Blue scapular or the Five-fold scapular), by reciting the: Our Father, Hail Mary & Glory Be, six times in honor of the Most Holy Trinity & of the Immaculate Mary are gained each time...433 Plenary indulgences, besides the temporal, which are innumerable." These can be applied to souls in Purgatory. St. Alphonsus.