Bonnell spring mattresses feature an interconnected mesh of springs. They add to the durability of the mattress, providing bounce and resilience. Bonnell spring mattresses offer a delightful sleep experience to those looking for an entry-level spring mattress. Pocket spring mattresses on the other hand feature individually cased springs called pocket springs. They move independently without allowing movement to travel from one end of the mattress to the other, this way you and your partner’s sleep movements do not disturb each other.