HanesWomen's Bralette Pack, 3-Pack, Low Impact Sports Bras, Racerback Workout Top, Moisture-Wicking, Solid Or Assorted Bra (Pack of 3)

I’m a 34a - the size chart says i should get a small but many of the reviews say that these run small. should i go with a medium or small?

Is the front lined, a second layer of fabric in it or as thin as the back?