The Fiandre NoRain Leg Warmer uses nanotechnology so the rain stays out. It does this without compromising the comfort, stretch and breathability of Sportful’s traditional ThermoDrytex Plus warmers. A single-seam construction eliminates possible points of abrasion. 4 anatomic sizes and silicone grippers mean you will be able to find a warmer that stays in place, stopping any awkward readjustments on the move.