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Sidewalks are prohibited currently, and will remain so going forward
In other words, when cycle touring in winter, its important to be able to manage body heat so you neither freeze nor overheat (then sweat, then freeze)
The US$5,350 SL 1 will have a Shimano Ultegra Di2 electronic group and Giant P-SLR1 wheels
Compared to more basic beginner helmets, it feels noticeably less stuffy on longer rides