When you run, your apparel is your equipment. Minor changes, and especially major changes, in what you wear and what products you use can significantly effect performance. Ideally, we hope new changes lead to positive changes, such as a fast race time or a new PR, but you can never really know until you try it. Personally, I have always been faithful to the brands that have always worked for me, but I have made it my mission to branch out and test out for myself the 'latest' items on the market.
Check out my latest reviews here