Hanes Women's Racerback Bralette Pack, Stretch Knit Low-Impact, Moisture-Wicking Cotton T-Back Bra Top, 3-Pack

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?