after riding with the hjc cl-14 size large that came with the bike (sv650s) for a few months, i realized that it was too big; strong side winds would rotate it almost 45 degrees and block my view. my head measured on the small side of medium so i ordered an airmada medium, primary reason being that it had a medium oval head shape. my head is like an egg shape with a longer front to rear than side to side. and i have a protruding noggin in the back. first time i pulled this out the box, i thought it looked way too big on the outside to be a medium, hardly looked different from my large hjc. but then when i tried pulling it on, i thought my ears were going to get damaged. then i could hardly get it off. but after a week of using it (painfully), it started to get more comfortable and now its been 4 months and its still snug but comfortable, although i probably should get smaller cheek pads. at full highway speeds and above, a hugh difference in buffeting and cross winds. also, i cant really tell much of a difference in weight by hand, but it makes a huge difference on the head, on the highway, doing 70-80mph, for an hr or two. and despite being so snug, its not that much quieter. the ventilation is a whole lot better, especially at low speeds. as for looks, i still think it looks huge on the head, makes me feel like Spaceballs. but i guess its all necessary padding to meet all these new international standards. oh and one more thing, i wish the shield lock wasnt so extremely rigid. im sure it'll stay in place though even in a severe impact. overall, id say it was money well spent for a quality helmet.