NIKE 7 Inch SW 2-In-1 Running Shorts Dri-Fit technology - means the fabric is lightwieght, breathable and comfortable. Tech Stretch Fabric lining - This lightweight fabric features stretchy materials allowing a comfortable fit. Elasticated waistband - allows for greater comfort and fit Reflective piping - for safer night running and greater visibility. This short also has an inner support - brief for those cold days to and to give you extra support where needed.