This not strictly an innerspring as the title suggests, it's a hybrid. Meaning less springs, more foam. It is very soft. I don't don't find this to be "medium" firmness at all & I only weigh 160 lbs. Very difficult to get in & out of. I am putting a 1 inch 'high density' foam mattress topper & think it will be absolutely fine for sleeping but don't think will ever be okay to sit up & read in bed.