For clothing, pack two of each item (hiking boots, wool socks to prevent blisters, windproof pants, technical T-shirts, gloves, hats) so that you always have a dry outfit available in case of rain. Also remember to bring a waterproof jacket, a merino wool fleece, and sunscreen whatever the season.  The climbs and descents are steep, so some people may want to bring trekking poles. If you plan to camp, don't forget your tent, mattress, sleeping bag, and cooking equipment.  If you have chosen the option of eating in a refuge, remember to bring some snacks such as cereal bars, dried fruit, and cookies. You can fill your water bottle in the rivers of the Torres del Paine Park. Their water is fresh and drinkable!