LeakBarrier PS200MU Ice and Water Armor is a self-adhesive, glass fiber reinforced, modified bituminous roofing underlayment designed for use under metal roofing. It is manufactured using a polyolefinic film on the upper side, this unique film laminate is non-abrasive and has anti-skid properties that provide good walkability. LeakBarrier Ice and Water Armor is specially formulated for use in high temperature environments.