The Andes, the longest mountain range in the world (8,000 km), spans 7 countries. It is divided into three major zones: the Southern, Central, and Northern Andes. Depending on the altitude of your trek, you will discover stunning landscapes where unique flora thrives across slopes and high plateaus.
Due to the mountain range's length, altitude, exposure and Pacific Ocean currents, the Andes encompass a wide variety of climatic zones. To help you select the right gear for every condition, follow our clothing advice and make the most of your Andean trek.
The unpredictable climate of the Andes
Influenced by the Pacific Ocean to the west and a continental climate to the east, the Southern Andes experience a cool, damp climate, whereas central Chile enjoys a predominantly Mediterranean climate. As you climb towards the high plateaus, temperature shifts become dramatic: conditions turn cold, with an annual average temperature not exceeding 6°C in the Puna. While daytime sun can push temperatures to 20–30°C, night-time lows can plummet to -10°C.
While rainfall is heavy in the southern section, precipitation is rather sporadic in the Central Andes.
The best time for trekking in the Andes is during the dry season from February to mid-April.
Clothing essentials for trekking in the Andes
The 3-layer system
During the day the sun is intense, yet in the shade the air cools down fast. Always keep extra layers close at hand to protect against both the cold and the sun.
I recommend using the layering system: wearing three layers of clothing so you can adjust what you wear to the temperature you feel.
- First layer
For your base layer, choose breathable thermal underwear made from materials such as silk or bamboo fibre for instant thermal insulation. Bamboo fibre also offers natural odour-resistant properties.
From the CimAlp base layer range, I recommend the WARM and EXTRA-WARM base layers if you feel the cold more keenly. They can be worn in temperatures down to -30°C.
During the day, opt for long-sleeved T-shirts, shirts or polo shirts to protect yourself from the sun.
- Second layer
For your mid-layer, wear a merino wool jumper if you are worried about getting cold in the evening, or a warm sweatshirt or fleece for insulation. Choose one with a zip so you can open and close it to regulate your temperature. Explore our range here.
- Third layer
For wind and possible rain, choose a durable windproof jacket, such as a softshell or hardshell, with a waterproof membrane and fleece fabric for thermal insulation.
Preparing for temperature shifts
In a region where the weather is highly changeable, I recommend zip-off trousers that convert into shorts. If you are heading into the jungle, wear mosquito-repellent clothing for tropical hikes.
For headwear, pack a warm beanie and a cap to protect against cold conditions and harsh sun alike, depending on the temperature.
To protect against sun exposure, always carry sun cream suitable for your skin along with quality sunglasses; UV rays are significantly more intense in high mountains than at sea level.
3 key factors to consider when choosing your footwear
The weight of your hiking footwear
The lighter your boots, the easier walking will feel. It is generally accepted that a heavy pair of boots can feel like an extra five pounds in your backpack. Manufacturers continually work to reduce weight while retaining support and technical performance.
Waterproofing
Moisture is your biggest enemy when trekking. Here are a few key tips to keep your feet dry: opt for breathable, waterproof materials that wick away perspiration while blocking external water. Choose designs with gusseted tongues that fully seal the upper part of the boot.
Lateral stiffness
On uneven terrain, your hiking boots must protect your feet and ankles to prevent sprains. A high-cut upper suited to all types of terrain is ideal. Its high lacing delivers exceptional stability and secure foot support.
- Longitudinal stiffness
It is essential that the boot prevents your feet from over-flexing when shifting your full weight onto the toe or heel. At the same time, it needs sufficient longitudinal flexibility to keep your feet from flattening under heavy loads.
- Arch support
The boot should support your arch so it does not collapse under heavy loads. A curved shank positioned between the midsole and the insole provides structural underfoot support.
Hiking socks
Hiking socks need to do everything ordinary socks do, but perform better. Ideally, they should reduce friction between your feet and boots, limiting rubbing and the risk of blisters.
They feature an extra layer of cushioning for better protection against impacts, scuffs and scrapes. They also shield your feet from elements that could harm them while walking, such as moisture. In addition, these socks provide better thermal regulation by expelling excess heat and wicking moisture away from the skin.
