You don't have permission to access the requested resource. Please contact the web site owner for further assistance.Comparing mattresses? See what makes Silk & Snow one of the best online mattresses in Canada. If all things about the foam type remained equal, then the higher density foam is usually considered more durable and will keep your mattress feeling the same and providing the optimal support over a longer period of time. Foam mattresses will soften over time with usage and inevitably will not provide the same support that was once there. This is why the density of the different foam layers (especially the top layer) is worth understanding.