I was weary about purchasing sight unfelt but this ended up being an amazing purchase. Upon opening it was already 10” and felt as if it was immediately ready to lay on but I still let it sit until bedtime since it arrive in the morning.  I’m usually a plush person but this provides the right amount of firmness that I didn’t even know I needed. It’s also helped with my husbands snoring.  However, because it doesn’t provide the coolness that I hoped for I couldn’t give it 5 stars. Overall, definitely worth purchasing.