Is a pillow top the same as a hybrid?
No. A pillow top is basically an innerspring mattress with a thicker layer of padding made of cotton, wool, foam, gel, down, etc. sewn into the comfort layer. Older coil mattresses often came without pillow tops, but nowadays most of them have one. As you probably suspected, if your innerspring mattress comes with a pillow top, you can’t flip it either.