One K Avance Wide Brim with MIPS and CCS

The popular One K Avance Wide Brim helmet now available with MIPS and CCS! Certified to ASTM standards. Helmet Shape Regular/Round – Is shaped for a head which has almost identical front-to-back and side-to-side measurements. Long Oval – Is shaped for a head which is longer front-to-back (from forehead to the back of the skull) than it is side-to-side (ear to ear). HELMET SIZE CM MEASUREMENT HAT SIZE X-Small 51 - 52 cm 6 3/8 - 6 1/2 Small 53 - 54 cm 6 5/8 - 6 3/4 Medium 55 - 56 cm 6 7/8 - 7 Large 57 - 58 cm 7 1/8 - 7 1/4 X-Large 59 - 60 cm 7 3/8 - 7 1/2 XX-Large 61 - 62 cm 7 5/8 - 7 3/4