There are 4 types of yarn used in artificial grass
Straight is your regular shape, it means the blades of grass are straight upright.
C Shaped yarn, this extra curl helps the grass to stand up more than straight yarn.
Diamond shaped yarn, this is supposed to give an even reflection of light from all angles.
Curly yarn, by having a curly top the surface is very flat and even. Used in our Pro Putting grass to help the golf ball run evenly and smoothly.
Most of the Artificial Grass has a curly brown yarn to represent the brown dead bits if grass. Without this the grass will look far too perfect and well kept. In most cases this is what you want, but sometimes a perfect grass is required.