By Mike McDaniel The soft shells over helmets are designed to prevent head injuries in the practices leading up to the regular season. View the original article to see embedded media. Jets coach Robert Saleh and Cardinals defensive end J.J. Watt have voiced criticism regarding the league’s use of “Guardian Caps” over helmets in training camp this summer. The caps, which are soft shells that go over the players’ helmets, are designed to curb head injuries as teams ramp up their activity in preparation for the 2022 season. Offensive and defensive linemen, linebackers and tight ends are all requi…