The Net Return Side Barriers for the Home and Pro Multi-Sport Golf Net | Contains Mishit BallsSide Barriers ensure that mishit golf balls never leave the hitting area. If you are using your net indoors or in an area where errant balls are a safety concern, Side Barriers are highly recommended. The Side Barriers are made of polyester netting, setup in under five minutes and can be easily stored or transported in your duffle bag. All our Side Barriers, with the exception of Heavy Duty Side Barriers are sold in pairs (right and left), can be