Many of the inserts sold with sports bras are lacking in quality.  After a few washes, layers of the inserts begin to peel at the edges.  Additionally, as the proverbial "lost sock", careful as I am one will jump into the black hole where those socks live 

These inserts are well made being stitched around the edges and should hold up much longer.  I will be purchasing more to both replace old ones and have backups for those that choose to join the socks 