What are the different types of fiberglass cloth?

6oz S-Cloth - 30 Inch Wide

"S" Glass fabrics are used by competitive riders for its added strength, durability and light weight characteristics. These same "S" glass fabrics are also used by the US Military for ballistic protection in armored vehicles and vests. That is why the world's most competitive surfers choose "S" glass fabric , the largest consumer of "S"Glass fiber in the world