These leggings are designed with Luxe Fabric which is thinner and cools quickly to keep you cool during your workouts. They also provide great support and coverage, especially amazing because they move with you. The four-way stretch material helps eliminate low-riding and bunching while the high-rise waist supports and flatters the tummy. Also, the stripes are both aesthetically pleasing and slimming to the eye.  I designed the horizontal stripe to be one perfect circle giving a slimming effect to your legs! And YES, the stripes line up! That detail is so important to me. You are going to fall in love with these leggings. I just know it. If you feel you are in between sizes, go up in size to be safe.