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.
Whether they play football, soccer, baseball or even golf, athletes who play on turf or dirt need cleats. Athletes wearing regular sneakers may slip or fall on muddy or wet playing surfaces. Cleats are athletic shoes with plastic or metal studs on the sole designed to help the shoes grip the playing surface. How cleats look and what they are made of are determined both by the sport and personal preference. For instance, all of those for school and youth baseball leagues must be made of molded plastic.