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You can either do a multi-day trek in the park
Two holes, one on either side, flow air through the back of the upper part of the helmet directly out the rear, under the diffuser
Constantly worrying about your kid handling and transporting expensive equipment will also kill your enjoyment of the overall experience and turn you into a nervous wreck
(It's worth noting here, though, that the Giro Aries Spherical Helmet ($250) still has a Mips system.) Trek, another of the worlds biggest brands, rolled out its WaveCel system a few years ago
US$ 24.24
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