Keep Cool Sleep Medela White LThe Keep Cool Sleep bra uses unique integrated breathing zones and new quick dry technology to help balance body temperature for maximum comfort. 4 Way Adaptive Stretch , fabric that adapts to your changing body from pregnancy up to breastfeeding. The criss cross design at the front makes it easy to access when breastfeeding. No hooks for maximum comfort when sleeping or lying down. With a breathable area on the back. Lightweight support.