Looking for an ultra-lightweight helmet for off-road riding? The brand-new Kali Shiva ($500) fits the bill. The company, better known in bicycle circles, has developed a DOT-approved, 1,050-gram (2.3-pound) helmet that uses a carbon-fiber shell into which the EPS liner is injected. Kali says the Shiva is 30 percent smaller than a typical MX lid.
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