Pocketed coils improve upon the open coil system of a traditional innerspring bed. In a classic innerspring, the coil support layer is a network of springs wired together to make a mesh that supports the comfort layer and the sleeper(s). Pocket coils aren’t interconnected. Rather, they’re each wrapped in individual sleeves made of fabric or foam. This construction allows for greater durability and less motion transfer than the more traditional open coil system. Note it isn’t just hybrids that have pocketed coils. Many innerspring mattresses also now feature this technology. They might have an entirely pocketed support layer, or they may combine the open coil support core with a transition layer of pocket coils.