Natacha Stasino + 5000m | KilimanjaroHerenthout4/55-11-2017Material is, as far as I can judge, top quality and is supplied with a very professional explanation of how / what / why. Regarding operational handling: excellent and very transparent organized with good follow-up! In Nepal I myself have been spared 100% from altitude sickness. Our 16-day trek has started at 2800m and had 5410m as the highest point. My husband had some very mild symptoms at 4400m but without impact on the trip. As far as I am concerned, it is worth repeating when a next high-altitude adventure presents itself.