Rainwear

Merino fibres lock away odour until the next wash, so a merino base layer stays fresh for longer.

Polartec fleece has a fuzzy surface that traps body heat in air pockets, so it is warm without weight and dries fast.

Down is light, packs small and gives a lot of warmth for its weight.

The North Face's ThermoBall fill is small balls of synthetic fibre that trap warm air like down and stay warm when wet.

GORE-TEX is an extremely thin layer that keeps out water and wind but still lets the fabric breathe.