I ordered two helmets : Vega Cliff helmet ( M size ) and Steelbird Adonis ( L size ) . My head measured between 58-59 cms so I was very confused which size to select. After refering to size charts on their websites and reading hundreds of reviews on Amazon and watching videos on YouTube, I decided to purchase two different sized helmets from two different brands to try them out. My helmets came to me after 4-5 days in good packaging and after unboxing I checked their manufacturing dates which showed " Manufactured on Jul- 18 ". Now let's get to comparison part. 1. Weight : a) Vega Cliff : 900 +/- 50 grams ( I think since this is a latest manufactured product, the weight has increased a bit.) b) Steelbird Adonis : 950 +/- 20 grams ( Theoretically, Adonis should be heavier but surprisingly it feels little lighter ) 2. Padding : a) I feel that the padding on Vega Cliff is better with better padding for cheek portion but padding for the head part is similar. 3. Shell Quality : a) Both the shells feels pretty sturdy but personally I feel that the Adonis feels little more sturdier. 4. Visor Quality : a) Both have good visors with good view but they are not fog proof which is expected in this price range. 5. Lock Mechanism : a) Vega Cliff helmet has shorter belt-lock mechanism and there's not enough material to adjust the length which chokes my throat a bit. But there's no such problem on Adonis helmet. 6. Additional points : a) The chin portion on Adonis helmet covers most of the chin and mouth but there's a plastic smell to it which may irritate you in the beginning but will diminish with time. b) Vega Cliff fits me perfectly ( snug fit ) while Adonis feels a little loose but wearing balaclava can help to get that snug fit.
Overall I can say both the helmets are pretty good for their price. But regarding the size issue, I think face shape and other head dimensions are also important in determining the right size for you. In my case even though my head length suggests that I should go for L size but M size fits me perfectly. So I suggest you to try multiple helmets.But guys please these helmets are no way for highway or touring purposes. Thank you for reading and I hope it helps.