young hiker backpacker man using trekking poles enjoying the thamserku 6608m mountain during high altitude acclimatization walk.

acclimatization activity acute altitude ams backpacker backpacking base bazaar camp climber climbing clothing clouds ebc everest extreme glasses high hiker hiking himalaya himalayas landscape layer male man mountain mountains namche nature nepal outdoor outdoors peak people poles protection scenic sickness sport sun thamserku tourist travel trek trekker trekking vacation walking