White Troxel Liberty Riding Helmet Size M? Nice

Trixel Liberty riding helmet. Pre-owned, excellent protective condition. helmet has not been damaged from falls or impacts, cosmetic condition very good, five very small marks (zoom in on pics to see). inside of helmet is very clean. Previous owners name on inside. Not sure of the size. My head is 57 cm in circumference and this helmet fits but just the tiniest bit snug. According to the Troxel site this would be a Medium size. Since you can get the correst helmet liner on the Troxel site you can probably make some adjustments to the size. Dimensions: 8 1/2" from front to pack, 6 1/4" side to side, see picture of measurements. Interested, make an offer. From a smoke and pet hair free home. Fast shipping. From the manufacture: Low profile, Durable, lightweight construction, Six mesh covered vents, DialFit™ system, FlipFold™ removable washable headliner with Air-Channel™ technology, ASTM/SEI-certifie