Helium

Minimalist rain shells live or die by whether they actually make it into your pack, and the Helium Rain Pants solve that equation by shaving weight down to the bare essentials. Built with lightweight Pertex Shield fabric, these are designed as dedicated weather insurance for thru-hikers, fastpackers, and three-season backpackers. You trade away hand pockets and full-length side zips in exchange for an ultralight piece that compresses down to roughly the size of an apple and weighs around six ounces.

In the field, performance closely mirrors that minimalist brief. The 2.5-layer construction seals out sideways squalls and cutting ridgeline winds reliably, but breathability remains modest once you are working hard. Without mechanical venting like thigh zips, moisture buildup is inevitable during steep climbs. The short ankle zippers allow transitions over slim trail running shoes, though attempting to pull them on over chunky, mud-caked hiking boots requires patience and clean footing.

Durability is respectable for a sub-six-ounce pant thanks to Diamond Fuse ripstop yarns, but this is still a thin shell that requires care. Heavy bushwhacking, abrasive granite chimneys, and crampon points will tear it quickly. Compared to standard hiking shells like the Marmot PreCip Eco, the Helium sacrifices durability and ease of entry for unmatched packability, making it ideal for ounce-counters who keep rain pants packed until conditions turn severe.