Instruct: Classify a review into positive or negative sentiment.
Query: Be careful of sizing.

I had to order the medium size direct from vendor as Amazon only had the large. I used the sizing chart and my arch measured just over 8.25 inches...which should have been large. However, my sister told me not to order large based on feedback comments. So, I went direct thru Footsmart. I received the medium (and paid for shipping) only to find the medium was too big. (This is starting to sound like Goldilocks.) I wear a 7 1/2N shoe...although shoe size is not the criteria. I went to return only to find, it would be $6.99 for the return label. I had already paid $4.99 for the original shipping. I wrote to them and they sent me a free label. Good vendor for that! I asked for replacement. Just got a credit for $9.99, so if I want this $9.99 arch support, I will have to pay yet another $4.99. I give up. I dont want it anymore. I will try something else direct from Amazon where I am a PRIME user and wont have to pay shipping.