If you want a highly contouring memory foam alternative, you have two options. Talalay latex is highly contouring because it is lighter and full of air bubbles, which gives it flexibility. If you want a foam that feels like memory foam and latex at the same time, this latex type may be for you.
Another highly contouring mattress option is a latex hybrid. With this setup, the contouring comes from the pocketed coil support core. Each coil in a hybrid mattress can move independently of all the others, which makes latex hybrids highly flexible. The mattress can alter its shape to fit yours, much like a memory foam mattress.