Troxel Liberty Black Low Profile Helmet 04-237
Available in:
Small 20 3/4" - 22"
53-56cm
Medium 22" - 22 3/4"
56-58cm
Large 22 3/4" - 23 1/8"
58-59cm
XL 23 1/8" - 24 3/8" 
59-62cm
(This size chart is a guide only. Head shapes can be unique, changing what size is needed.)
Ultralight, low profile helmet with large vents providing superior ventilation for a cooler, more comfortable ride. With a DialFit™ comfort system and removable and washable headliner with FlipFold shims for personal fit options, the Liberty is a great option for all types of riding disciplines.
Key features include:
Low profile
Durable, lightweight construction
Six mesh covered vents
DialFit™ system 
FlipFold™ removable washable headliner with Air-Channel™ technology
ASTM/SEI-certified