For our trekking programs, we advise the following gear for each person:
Sunglasses (with UV protection)
1st layer – Shirt and underwear: Polypropylene, Capilene, Merino wool, Polyster (NO NATURAL FIBERS, NO COTTON PLEASE!!!!!!!)
2nd layer – Fleece jacket or pullover (something like Polartec 100 or Patagonia R1 is recommended)
3nd layer – Waterproof Jacket or Poncho(Waterproof is not the same that water-resistant)
2nd layer – Fleece pant for extra cold nights/summits (optional)
4th layer – Down/synthetic insulation jacket if you get cold easily (Remember Los Nevados is not just cold is HUMID and WET)
Pijama or spare set of dry clothing for sleeping or changing wet layers.
Glove for sun and cold protection.
Good quality Trekking boots/shoes/trail runners with good traction
Sandals/Crocs/Light shoes for campsites and huts (1 pair)
Trekking socks (2 pairs minimum in case one pair gets wet)
source link Expeditions take 50L pack.
Backpack with enough volume to pack all your stuff INSIDE not hanging from the outside
Dry bags/plastic bag for packing inside the backpack.
Hydration system as a Camel/platypus bag or bottle – 1.5 liters minimum
Expeditions and Climbing trips We recommend you to take your own sleeping bag.
Headlamp is mandatory
Personal toiletries: Toothbrush, toothpaste, dental floss, pack towel, soap (organic and/or biodegradable), comb/hairbrush, toilet paper, ear plugs, hand sanitizers (must).
Personal prescription medicine if need, be sure to have it with you from home.
Entertainment like books and music Camera and extra memory card and batteries.