RC4 20 Jr Fischer RC4 20 is an excellent option when it comes to outfitting your junior for a day on the hill. Start your child off right with a great foundation for skiing, RC4 20 offer a flex of 20 so small skiers can flex the boots and learn how it feels to ski. Comfortable Thermoshape allows the boot liner to take shape of the foot used in the boot, this results in great comfort and performance. Outfit your smallest skier with the best from Fischer. RC4 20 offers a slightly stiffer boot with 1 more buckle than the RC4 10 made for juniors who aren't the smallest in the pack.