ISI mark is a certification mark for industrial products in India. The mark certifies that a product conforms to the Indian Standard, mentioned as IS:xxxx on top of the mark, developed by the Bureau of Indian Standards (BIS)
DOT stands for Department of Transportation. This is the US government approved standard and the most popular helmet type. DOT helmets are more shock absorbent and designed at protecting your skull from 90% of impact types. The maximum g-force allowed by the DOT test is 250g’s, and an impact of 200-250g’s to your head would cause a survivable, yet harsh brain injury.
ECE 22.05 helmet was made by the United Nations Economic Commission for Europe, and is the most common helmet standard used internationally used by over 50 countries worldwide. Helmets certified to ECE 22.05 are approved for all competition events by AMA, WERA, FIM, CCS, Formula USA and MotoGP and are used by almost every professional motorcycle racer competing in world championship road racing.
Snell Memorial Foundation is an independent organization established in 1957, named after race car driver William “Pete” Snell who tragically died in 1956 when his helmet failed to protect his head during an accident. The Snell M2005 is the old standard favoring a more shock resistant helmet while the more recent M2015 standard favors shock absorbancy. Snell certified helmets are allowed for professional motorcycle racing.