Spirit Helmet Troxel Helmets 04 533 Troxel Spirit Teal Duratec Riding Helmet Spirit Helmet Troxel Helmets Spirit Helmet Troxel Helmets Troxel Spirit MIPS Riding Helmet, Black Duratec, Size Medium eBay. The #1 riding helmet is better than ever! The redesigned Spirit from Troxel offers a deeper full coverage fit for incredible comfort and security. Riders love its new low profile design and DialFit technology that work together to create the most comfortable fit for a variety of head shapes. The XS size fits great on young riders with its drop back design that increases helmet stability. Low profile Full coverage design for optimal comfort Maximum airflow vent placement FlexVisor DialFit system Extensive size range, including XS for young riders FlipFold removable washable headliner with Air Channel technology ASTM SEI certified