Let the sparks fly! The angled layers of this HD wig can be flipped out with a flat iron for a sassy shag or blow-dried over a round brush for a super sleek bob. The SmartLace cap creates a beautiful, natural hairline. The Jon Renau HD (Heat Defiant) Collection features: Combines the easy wearability of synthetic wigs with flexible styling like human hair. Heat Defiant synthetic fibers withstand up to 350 degrees, allowing you to blow dry, flat iron, crim and curl HD wigs just like natural human hair, making everyday different. HD fiber features ultra fine denier and true-to-life feel, making it more luxurious and realistic that other other synthetic hair on the market, capturing the natural sheen and glossy touch of healthy human hair.