Here's what I found a while back when seeking info about tumor necrosis. 1) Necrosis in the tumor means that the cancer cells in that area are dead. The pathologic finding of necrosis suggests a fast-growing cancer. This often happens because the tumor runs out of blood supply in the central portion. Without a blood supply, the tumor cells cannot live.
In association football, where the shoes themselves are known as football boots, there are three different cleat types. There are soft ground cleats which are made for wet weather. The soft ground cleats are always replaceable, and are almost always metal, so when they wear down they are easy to replace.
Unlike football cleats, soccer cleats don't have a toe cleat, which is made for straight-ahead movement. Soccer turf shoes have molded outsoles and are made for harder outdoor surfaces and artificial turf. They are built with raised patterns on the bottom somewhat like a tire tread to maintain traction.