SHRED. Luminary Mountain Bike Helmet Size Chart

Dual-Size Helmets – Size Chart

Size (Inches) XS/M M/XL
Head Circumference 203/4 – 221/2 221/2 – 24
Size (cm) XS/M M/XL
Head Circumference 53 – 57 57 – 61

Measurement Guide

Use a tape measure to find your head circumference. You should measure from the mid of the forehead above the ears to the back of the head.

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Summary of Terms: Free shipping on orders $/€100+ and free 100-day size and product exchanges in the US and EU. Refunds incur a $/€10 return label fee. Pro Program, ExpertVoice, OutdoorProLink, and orders with discounts over 40% are eligible for exchanges only and incur a $/€10 fee. All returns must be unused, in original packaging, and in sellable condition. Delivery times are estimates, depend on availability, and orders are processed first come, first served. For customers outside the US and EU and full policy details, see our FAQs.