Why do hand grips tear so easily?

Sarah’s grip ripped on a simple glide kip.
It can be dangerous if they rip while the gymnast is on the Bar.
They should be replaced as soon as a small rip starts on the grip.
Coach Mark Van Wyk initiated a tradition at his gym. “Handguard Heaven”. Gymnasts toss broken and torn grips like this up into the rafters at Calgary Gymnastics Centre.
