HipMaster enhances roof ventilation at the hip with a patented triple-baffle system engineered to keep blowing rain and snow from getting in. The low-profile design, unobtrusive. Nailing supports and structural ribs make the HipMaster crushproof, to withstand falling tree branches and hammer blows, and it resists cracking. In addition, an internal filter blocks out insects, leaves and pine needles. Self-aligning, interlocking ends make it easy to install correctly. Built-in end caps adjust to the roof pitch while the ship-lap design allows for expansion and contraction as temperatures change.