I was concerned about buying trainers without trying them on first & I read loads of reviews about Asics' sizing & thought you might find this useful. My left foot is a UK size 6.5 and my right foot is a UK size 7. I decided to go for a size 7.5 & luckily this fits both. If both my feet were a size 7 & I ran long distances, I'd be tempted to get a size 8. I hope this helps. I love the colour & the arch support is excellent. I feel like I'm walking on air. And they arrived a week early so I am extremely happy !I have had about 10 pairs of asics over the years, and never has a pair not been true to size apart from this one. It has rubbed me which is a big shame. However, the support and colour are rather good, so once I've worn them in they'll be OK. However, I've usually set off on long runs with new pairs and never had issues. I am a four, always buy a five in asics. I wouldn't go up again, but i will have to wear thick slipper socks with these for a few days I think. Arch support however feels secure and rigid, which is what I like and need.I was initially pleased with these, BUT after just 2 months they have developed a hole at the front - this has never happened before & I have kept Asics trainers trainers for years. I am very disappointed in this poor quality for £100 trainers. The seller was not interested & told me to contact Asics, tbut they will not help as they were not bought from their web site or store. In addition the coloured loop which holds the laces (seee pic) is a rough nylon fabric which rubs on the skin causing blisters.I have worn Asics for years now and specifically GT1000s for the support they offer. I have literally just worn out my previous pair of these in exactly the same size and exactly the same colour. The colour does fade a bit with use - but not much, it is bright. So when I put these on, they are just comfortable, do exactly what I expect them to do.I would add that although I have said they fit just right, I normally am a UK 6 and have to buy a 7 in these but I have had to do that for years, so they fit just right providing you buy the right size allowing for that.Color (pinkish) is brighter than in picture! I like them a lot, they look pretty and feel light and comfortable. I went for my first run with them today, no problems at all. These shoes do run a bit small, following other customer advices I bought 4.5, when I am usually a size 4, and they fit perfectly.