The optimal material for batting cages is netting, and they are typically rectangular in shape. Chain-link fence is not required but can be useful to enclose the netting to prevent vandalism. However, this material is not suitable for the primary impact layer because it will warp the fencing and damage balls.
Indoor batting cages are typically suspended by steel cable lines, 1 line every 6 - 8 feet. The anchor points being the most important component, typically connected using a steel plate to the wall. Without strong anchors, the netting will sag.
Outdoor batting cages are typically installed using steel pole sections (2 uprights & 1 cross-bar per section), spaced every 12-20 feet. The greater the span between supports, the more sag in the netting and less usable the cage becomes. 
Netting can greatly vary in quality and durability. #21 Gauge is suitable for little-league players, #36 Gauge is suitable for High-School players, and #60 is recommended for Commercial facilities and Pro Players. Resources such as this Netting Infographic Guide are helpful for identifying the best netting for an application.
How it's used
A batter stands at one end of the cage, with a pitching machine (or, less often, a human pitcher) at the opposing end. The pitcher or pitching machine pitches baseballs to the batter, who hits them. It is recommended to use a protective pitcher's L-screen to prevent batted balls from striking the pitcher or machine.
The cage is used to keep the loose baseballs within a certain range so that they're easy to pick up and are not lost. Batting cages are found both indoors and outdoors.
The interior floor of a batting cage may be sloped, to automatically feed the baseballs back into the automatic pitching machine. The automatic pitching machines using sloped floors usually pitch out a synthetic baseball or softball, rather than an official solid core leather hardball.
Commercial batting cages pitch with several different speeds, which can range from 30 miles (48 km) (for softball) to 90 miles (140 km) per hour.
Cricket nets and tunnels, used by cricket batsmen are similar in purpose, but bowling machines are much less common than facing a live bowler (this reflects the fact that nearly half of the members of a cricket team are specialist bowlers, and therefore proportionately more bowling practice is needed in cricket than pitching practice in baseball).
- Schneider, Chad. "Batting Cage Getting Started Guide". Practice Sports. Joe Stubler. Retrieved August 15, 2013.
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