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I have been wearing Grid Nitrous since I started running a few years ago - never given me any problems. I managed to find the same pair online although they were already discontinued 18 months ago but they are now starting to wear out.
Ideally, I would simply buy another pair but I think all old stock is now gone! So the question to the more experienced - is it a simple case of knowing what model replaced them, or is tehre no such thing and I should be heading back to the shop for an assessment?