The #1 riding helmet is better than ever! The redesigned Spirit 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.Hat Size and Head Size XSMALL 6 1/4 - 6 1/2 | 19 5/8" - 20 3/8" SMALL 6 1/2 - 6 7/8 | 20 3/8" - 21 5/8" MEDIUM 7 - 7 3/8 | 22" - 23 1/8" LARGE 7 3/8 - 7 3/4 | 23 1/8" - 24 3/8"