Mesh crib bumper, oh how I love you. You keep my baby from getting his crazy kicking legs stuck. You keep him from smashing has face against hard wooden slats yet don't present a suffocation risk. You enclose him some which helps him feel safe and cuts down on distractions from sleep. You allow me to sleep next to him in my bed without disturbing him. You provide a fun surface for him to scratch* which also makes it easier for him to sleep. I can say I highly recommend you.
*E has been "scratching" things with his fingernails lately. He often does it as a soothing ritual. It's cute, but weird. Also (in a very small stage whisper) E has been falling asleep on his own in the crib and sleeping there very well most of the night, most of the time. Shhhh. Don't tell anyone.