Highland Slate® Impact Resistant (IR) shingles are especially designed for high performance and classic beauty at an affordable price. Highland Slate® IR shingles are algae resistant and help protect against staining or discoloration caused by algae. Highland Slate® IR is perfect for both residential and commercial applications and is warranted to withstand winds up to 110-mph (a category 2 hurricane). Features an oversized shingle, extra-heavy mat, a technologically advanced sealant, and they meet UL 2218 Class 4 Impact Resistance at time of manufacture.