best memory foam mattress near thillainagar growell beds and furnitures Bonnell springs are a traditional type of mattress coil system. These springs are hourglass-shaped and interconnected, providing stability and support across the mattress surface. Bonnell spring mattresses are known for their durability and affordability. A queen size mattress is larger than a full size but smaller than a king size. It typically measures around 60 inches in width and 80 inches in length, providing ample space for single sleepers or couples.