these trainers are fabulous. They offer an amazing amount of support and you can move in them very freely and know your ankles calves & quads are fully supported whatever movement you are doing around the tennis court. Having had quad and knee injuries over the years, I have found a pair of trainers that actually protect you from injury. I did swap to my white pair of lesser quality trainers in summer for 1 day, and found after 4 hours of doubles play , my left knee and quad were very tight and sore whereas I had had no problems when wearing the Gel 5's . I immediately swapped back to the gel 5's next time I played and had no problems again. They are very expensive for ladies trainers, but are worth every penny, I look on it as if it saves you 3 trips to the osteopath /chiropractor then they have paid for themselves. it's a shame that it is difficult to get hold for ladies Gel 5's easily and the colour choice is very limited, especially if you have to wear white trainers..