I walk 30 minutes each day and, whenever possible, buy Ryka brand walking shoes each time I buy new ones.  They fit the best of all the brands I have tried since they are made specifically for a woman's foot.  I do not get the slippage in the heel like I do with other brands.  These are comfortable right out of the box and have a great cushioned feel.  This is my second pair of this style.  I bought the first last year in a mall store in a size 10, my usual size.  They fit fine but, to me, feel a bit shorter than usual.  I bought this pair from Amazon in a 10 1/2 (the mall store does not carry 10 1/2 but jump right to an 11).  This gives me that tad more room in the length that I wanted.  I feel it is probably best to go up 1/2 size in this style.  Thanks to Amazon for carrying this half size.