Need Firm Support?  Then this Headleveler pillow is for you. Offering very firm support to the head and neck, this very firm pillow is ideal for people with wide shoulders who sleep primarily on their back or side. If you’re not sure what kind of firmness you need, take into consideration how firm your mattress is. The firmer the mattress, the thicker your pillow needs to be in order to properly support your neck, back and shoulders.