Gear & What to Wear
Ol Doinyo Lengai is a one-night push, not a multi-day mountain expedition. You leave the Lake Natron base around midnight, climb loose ash and scree by headlamp, and are usually back down by late morning. The base can exceed 40 °C; the crater rim before sunrise is often cold and windy. Pack for that swing, plus dust and bad footing, and leave the heavy Kilimanjaro kit behind.
What to wear on the climb
Dress in layers you can peel off. Start cool enough for the lower slopes, and keep a warm layer in the pack for the rim.
Start in a light synthetic or merino T-shirt and hiking trousers. Zip-off trousers are useful so you can switch to shorts on the hot descent. Avoid cotton: it stays wet and gritty once the ash gets into it.
Add a light fleece or grid-fleece hoody for the hours before dawn. A thin wind shell or softshell over that is enough for most dry-season summits. A heavier insulated jacket is optional; a compact down or synthetic puffy is worth it if you run cold or are climbing in the cooler months (roughly June–August), when the rim can feel genuinely cold in the wind. One climber account describes the summit as cold enough that gloves and a neck warmer mattered even after sunrise.
Wear broken-in hiking boots with ankle support and an aggressive tread. The upper cone is loose volcanic ash and lava channels, and the descent is where most people slip. Low trail shoes work only if you already trust them on scree; if you use them, add short gaiters so ash stays out of the collar. Take a spare pair of socks in the pack.
A buff or light neck gaiter keeps dust out of your nose and mouth. A warm beanie and light gloves cover the pre-dawn rim; a sun hat with a brim replaces the beanie once the sun is up. Sunglasses are for the descent, not the night climb.
Or