Ultralight, waterproof rain poncho.
The Ultra-Sil Nano Poncho from Sea to Summit really doesn't weigh much - it weighs a straight 145 grams. The rain poncho is made from a very light yet robust nylon material with a polyurethane coating on the inside and a silicone coating on the outside. The fully water-repellent material is double-stitched and all seams are taped. The adjustable, double-stitched hood has a drawstring and a wide brim. The rain poncho can be put on and taken off quickly and also fits over a backpack thanks to its generous cut. You should always have it with you in case the sky turns dark. Packed small in the packsack, it fits well in any backpack.