General equipment recommended
In the city of Kathmandu from June to September (and nowadays also October) is the time of the monsoon, so it can rain normally, usually at afternoon, evening or at night. It implies that when it rains temperatures do not rise excessively, but when it does not rain and the sun and hot are strong. Cool summer clothing, shorts and lightweight and easy to remove footwear will be most appropriate, plus some lightweight clothing for early morning or dusk, or in the rural areas and at higher altitudes, where temperatures could be fresher. During winter it will be necessary to wear clothes for colder temperatures, although during the day will not be icy, with average temperatures of between 2º and 20º.
We list here some pieces to include in your personal equipment and/or luggage, but of course, the final decision is yours:
Equipment for trek
Treks often start at a low altitude and the early stages can be sultry, but as we win altitude is refreshing. Above 4000m the nights are very cold and will test your sleeping bag and clothes even if you are inside the lodge. The quantity and quality of clothing you carry will depend a lot on the trek you make, its duration, the season and how your body feels hot and cold conditions. Of course, you should try to reduce the volume and weight of the backpack. We are in the mountains and we cannot pretend to wear clean clothes every day. There is usually the possibility of washing clothes during the afternoon or on a rest day in good weather.
If porters carry your stuff, you should not go over 10kg of load that, joining other 10kg from other trek mate, and together with porter things, will already approach the 30kg they are going to load. You will carry a small backpack with the things you need during the day. It's a little bit amazing how much useless stuff we carry.
The best and most common is to wear in layers: short-sleeved T-shirt, long-sleeved T-shirt or similar, fleece jacket, down jacket, waterproof jacket. With all possible variations. As for T-shirts, we recommend the merino wool, as they do not catch an odour and can be worn many days in a row before they ask loudly for a wash, while they are made with a more environmentally friendly material than synthetic ones. Over, a long-sleeved T-shirt with a higher weight or a thin polar, and have a thicker one for the cold, etc. For most treks, a down jacket will suit you very well, since it weighs and occupies little in relation to its warm, but it is not necessary to get one to raise an 8000m summit, although from 4000 meters can be chilly, especially when it gets dark. It is likely to rain or snow at some point during the trek. Taking into account that there is usually humidity and that you will be walking we recommend a "poncho", as it also covers well the backpack and allows better air circulation. The choice of a large umbrella is also good. Both you will find it well priced in Kathmandu or Pokhara.
Footwear is the most important element of the trek and, in fact, many times we carry it in cabin luggage in case our backpack is lost during the flight to Nepal. Be aware that start using a newly bought footwear on a multi-day trek is not a good idea.
Most of the treks can be done perfectly with a mountain running shoes, but it will depend on the itinerary, season, and your preference. A light footwear to stay in the lodge are very useful, and they work also fine as emergency shoes if your main ones get broken. Many people find that flip-flops are quite useful.
Many trekkers use walking poles, but this is not mandatory. It depends on your confidence walking with them.
Related to pants, the typical ones in which the legs can be removed are quite practical, but not essential. Another pair of trousers for higher altitude and/or waterproof pants can also be fine. Nowadays wearing leggings is not as "inappropriate" as it was years ago and are a good complement to wear under your pants on a cold day or as a pyjama.
For girls (and also for boys) a large and light scarf that can be used in many ways, like as a skirt if you want to wear leggings but more "correctly", to protect yourself from the sun... or in case you suddenly need to hide yourself to do some "work" and there are no trees or rocks to keep people's eyes out.
Trekkers use to be worried about what to carry. In most of cases you will need more or less the same you use in some days trek in your own area and be aware that Nepal is a sub-tropical country, so in lower altitude temperutes will be warm or hot and humid.
We have done a basic list, to which you can remove or add things and adapt it to your own tastes and get the amount you will need. Naturally, it varies according to your sensitivity to the cold or the heat, to the maximum altitude of your trek and to the time of the year in which you do it: