Crib mattress pad? SIDS risk??

Molls

I have a water resistant mattress and I just added this cover to it. I put the sheet on top and now it just seems like it’s puffy rather than a hard/flat, smooth crib mattress. Is it suppose to feel like that for air flow? Idk I’m about to just trust my mom gut and take it off. Maybe save for when baby isn’t a baby anymore!