Frankfort, MI used IMPERMEABLE covers with insulation.

These photos were taken in the Spring of 2010 in Frankfort, Michigan. You are seeing the turf as it appeared immediately following its uncovering. GreenJacket^® IMPERMEABLE covers with Bunker Liner used as insulation to protect greens from ice damage, crown hydration, desiccation, and help to keep the turf dormant during those freeze-thaw-freeze cycles, resulting in healthy green turf in the Spring.