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I have been running for just over two years and I have just completed my second road marathon in 3:36 hours and now want to get a sub 1:40 on my half marathon. I am a serious over-pronator but before my last marathon I bough some orthotics which have made a massive difference. I am female, reasonably tall (1.78 m) and about right weight for my height (64 kg). I understand that racing shoes are lighter and so have less cushioning and stability. I was wondering, how fast do I have to be before I would benefit from racing trainers to get my half marathon PB and is there a body weight/speed ratio at which there is no benefit (and possibly more harm than good)? I really don't want to have all-the-gear-and-no-idea or spend money on something unnecessary. I'd appreciate any advice!