ATD Women's Fitness Classic 2.0 Spandex Workout Shorts 84% Nylon Made in USA Elastic closure Women's workout shorts are soon to be your favorites! It has soft1 inch elastic waist that is cover-stitched with a smooth soft and stretchable stitch. The leg hems are cover-stitched and both waist and legs are bar-tacked for longest life. Shorts will not ride up. The Fabric is a tricot knit warp knit made from buttery soft nylon yarns. The Compression workout short from Aero Tech Designs is the ideal short for exercising, it hugs the muscles for support and reduction of muscle fatigue. Ideal Exercise shorts for activity where freedom of movement is essential and support of the muscles is desired. Treat yourself to comfort and freedom of movement with our unpadded Women's Compression Workout Shorts. These wonderful exercise shorts are so comfortable they will feel like your second skin. You will fall in love with them as soon as you start wearing them. Easy care: Machine wash / air dry. Why Compression? Spandex shorts increase blood circulation which oxidizes the muscles during exercise. More oxygen will reduce the build up of lactic acid which can be painful. Compression from our bike shorts also supports muscles to reduce movement. The excessive movement of flesh during exercise can be tiring. These compression shorts can also help reduce delayed onset soreness from exercise by compressing muscles to increase the blood flow to heal muscles after workouts. Women's Clothing Size Chart: X-Small 2-4, Small 6-8, Medium 8-10, Large 12-14, X-Large 14-16, XX-Large 18-20, XXX-Large 22-24, XXXX-Large 26-28, XXXXX-Large 30 Soft 84% Nylon and 16% Spandex with four way stretch. They are made of the highest quality tricot knit microfiber that will not disintegrate like the cheap stuff. These workout shorts are guaranteed to provide years of comfort and performance for your active lifestyle.