Hardness of pitch - determined by clay content, moisture content, soil density and preperation (large volume roller) - is the single most significant factor for true, consistent bounce in T20. On very hard, very tightly packed pitch blocks, e.g. at Wankhede or the WACA, the impact of the ball hardly moves the surface from its resting position: 100% of kinetic energy is conserved (once... https://faairplay.ac/