Padded support shorts sometimes worn to protect the thighs when the player slides into the bases. Some sliding shorts contain a pocket for a protective cup. This is so the player does not have to wear a jockstrap and sliding shorts at the same time, although many players find the cup is held in place better by wearing it in a jockstrap under sliding shorts.
This sounds like a lot of information, but with a little practise on the coaches part, it runs quite smoothly. Two to three reps per player in the field per section is quite adequate, and with 14 men on the field, this whole routine should take about 7 minutes. It's quite snappy, and quite impressive. I had many a parent marvel to me after witnessing it - "you look like a professional team!" I wouldn't try the routine with anything less than a 14 yr old select team, but with the talent to do it right, it's fantastic.