Most of your clothing that you are not actually wearing will be carried by your porter. Although a guide will always accompany you on the trail, you are unlikely to see your porter except at the huts or the camps. Therefore it is important you pack carefully – the smaller day pack you carry yourself. Anything you need during the course of the day should be in your day pack including and, most importantly, something warm and something waterproof. Light clothing is generally sufficient until you reach the 3-4000 metre altitude range – so essential you always have something warm and waterproof right with you. Beyond these altitudes, even if the mornings are glorious, you must always be ready for dramatic changes in the weather, including snow storms.
It is for the final ascent that all your warm clothing is important. The ascents are normally done at night and this is when the coldest temperatures are experienced. You must be prepared for temperatures of minus 25 Celsius/ minus 13 Fahrenheit. As a rule, you should wear 2 pairs of socks, 3 layers on the legs, 4 -5 layers on top. A balaclava or ski-mask is necessary to keep the head warm and you should have a hood to protect your head from wind. Mittens and also sunglasses.
Note: the bag the porter carries for you should not exceed 15kgs. If bags are too heavy items may have to be removed or the climber may choose to hire an additional porter.