Our indoor facility, which we share with the Steelers, is field turf. In addition, we have one outdoor field turf field and another grass field. All three are very well cared for and excellent for shoeless training.
My guys perform all tempo and warm up without shoes on during the off-seasons; however, some opt to keep the shoes on as it’s their choice.
Some even perform linear speed work barefoot; however, most have shoes on for the speed work.
The field turf is great from a pliability standpoint in that, at the most, I may have one guy out of 50 or so that ever deals with shin splints.