In May 1996, Siffredi snowboarded down the north face of the Aiguille du Midi on Mont Blanc along the Mallory track, a descent of 1,000 meters with passages of more than 50-degree incline. In 1998, in preparation for climbing the Himalayas, he climbed Tocllaraju in Peru (6,032 m) with Philippe Forte and René Robert. In 1999 he climbed Dorje Lhakpa (6,988 m) in Nepal and made the first snowboard descent of the mountain.