Teclite Gilet: Packable, lightweight, versatile. The new O3 Jacket: Buffalo made light. Active Lite Shirt: The milder weather Mountain Shirt. Teclite Gilet: Packable, lightweight, versatile. The new O3 Jacket: Buffalo made light. Active Lite Shirt: The milder weather Mountain Shirt.
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Everest. Western Cwm. 6,700m

by Edward Austin on Jul 30, 2025
Everest. Western Cwm. 6,700m

Climbing the Khumbu Icefall.

Crossing crevasses.

Hauling instruments through deep snow and shifting weather.

This is Losing Their Cool, a high-altitude research expedition led by scientists from five UK universities.

Their goal: to better understand temperature conditions in the Western Cwm, one of the most extreme and fascinating environments on Earth.

The team installed weather stations, thermistor strings, and ice-core sensors at 6,700 metres, just below the Lhotse Face. Working in –10°C mornings and wind-blasted afternoons, every decision counted.

Buffalo kit went with them. Explorer Shirts and HA Salopettes were chosen for their simplicity, durability, and ability to adapt when conditions changed fast.

“The perfect balance of warmth and venting, whether we were climbing or stood still.”

We’re proud to support the team and the vital research they’re carrying out in the high Himalaya.

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W
Men's O3 Jacket
William Whittingham
03 Jacket

A brilliant versatile all year round jacket & an excellent lighter alternative to my mountain shirt.

m
Men's O3 Jacket
martyn phillips
Brilliant bit of kit

Brilliant bit of kit.
Nice & lightweight but still enough insulation for the cooler weather

C
Men's O3 Jacket
Carl Dickson
Lovely jacket

Lovely jacket. Great quality. Just right for the warmer months. Fits true to size

J
Men's O3 Jacket
James Gillies
I love this jacket. Fuss free & just works

I love this jacket. I've worn it over two consecutive June weekends in Wales. Typical weather, driving rain or howling gale and drizzle on the top of hills, baking sun in the valleys. The 03 jacket works across it all. Just adjust the zips and vent accordingly. However, some pit zips would make it 5 stars. It's well-made, fuss-free, and the orange is highly visible.

M
Men's O3 Jacket
Mark Downie
marks review

Excellent quality bit of warm kit for the summer months.

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