The Flex Dry brush from Wet Brush features Duo Flex Technology. A versatile, multi-use brush that every stylist needs. Duo Flex technology combine ItelliFlex bristles with a flexible brush head. The IntelliFlex bristles detangle hair while the vented design removes excess moisture for faster blow drying. Brush contours to the scalp and is safe for wet or dry hair, and can be used with a blow dryer.