Climber Mark Synnott, who's been on the TNF team since 1997—prior to Summit Series' launch—is one of them. "The TNF gear and clothing we were using were all precursors to the Summit Series—and just as good, but the official launch of Summit Series really set the tone for what was possible for exploration with the best gear out there," he tells me.
In 2000, the same year Summit Series launched, Synnott undertook an expedition to Jannu, a 25,300-foot peak in Nepal. They brought along new metallic grey jackets with a ripstop pattern on them and synthetic insulation inside instead of down—early prototypes of what would become The North Face's Redpoint jacket. "I had been advocating for some time for a synthetic coat that was about the thickness where you could wear it as outerwear if it wasn’t too cold, but could turn into a mid-layer if it was super freezing," Synnott says. "We helicoptered from Kathmandu to Ghunsa, which is at around 10,000 feet. I put the coat on in the helicopter and I never took it off until the end of the expedition."
Now, synthetic puffy jackets are commonplace. And Synnott still has his Redpoint hanging in the closet.

Courtesy The North Face
The unique collaboration between product designers and high-level athletes produced other impactful pieces, too. Pro skier Ingrid Backstrom recalls how The North Face athletes pushed for women's-specific bibs. "For a long time, nobody thought that women wanted bibs for skiing," she says. Working with designers, they helped create new bibs that allowed for freer movement and the ability to go to the bathroom without needing to take off a jacket.
Some pieces of gear that have come through the Summit Series pipeline were one-offs, made specifically for particular expeditions. One such item was a three-person porta-ledge used by Renan Ozturk, Conrad Anker, and Jimmy Chin during their second attempt to climb the Shark's Fin on Meru, a 21,850-foot peak in the Indian Himalaya, which was documented in the 2015 film Meru.
"On the first expedition, we thought we could have three people in a two-person ledge and have the third person sleep below in a hammock," says Ozturk. "That didn’t work. It was way too cold below, so we had a custom three-person ledge built, which was a legendary effort by Conrad and the whole TNF team that made the difference."