A spring mattress is made from individual pocket springs. Each pocket spring is enclosed within its own fabric pocket. Working independently from each other, each spring reacts only to the pressure applied to that area. This means the springs in a pocket sprung mattress work completely independently of one another and can provide your body with better pressure relieving support. Pocket sprung mattresses are a great option for anyone who loves a cosy, well-supported sleep. Here are some of the key benefits you need to be aware of. If you’re looking for a mattress that will stand the test of time, look no further than a pocket sprung mattress with a high spring count – they’re built to last. Pocket springs in mattresses are usually made fromsteel which is twisted into a spiral to create the rudimentary spring.