NIKE ACG'S LAVA FLOW ULTRALIGHT FILLS WITH 90% GOOSE DOWN

Nike ACG introduced the Lava Flow Ultralight on October 1, 2026 with a clip captioned Thermodynamics testing footage 001, and the number in that caption is the whole pitch. Nike's own spec sheet puts the jacket at 1,000 fill goose down and 248 grams, or 8.75 ounces, in a men's medium, against the 700 fill, 10 ounce Lava Loft the brand unveiled in Shanghai on November 6, 2025. In eleven months ACG shaved an ounce and a quarter off its down jacket, raised the fill power by 300 points, and sold the result with a thermometer instead of a lookbook, hauling a 35 person crew to Moab, Utah for a 48 hour test that logged a surface high of 107F and a night low of 37F.

Retail listings at Flatspot and CCS describe the fill as 90 percent goose down and 10 percent feathers. Nike's page says the same thing a different way, grey goose down at a minimum of 90 percent, then adds the figure the retailers skipped, a 1,000 fill rating. Fill ratio counts how much of the stuffing is down; fill power measures how much air it traps.

255 Grams on House of Heat's Scale, 217 for a Women's Small

House of Heat weighed a men's medium at about 255 grams and a women's small at 217 grams, and found the packed jacket smaller than a 32 ounce water bottle. Scott Baldwin of Front Pack Sports rounded his to 10 ounces and compared it to a few chicken eggs, so three sources land within an ounce and a quarter of each other on the same size.

Shell and lining are 100 percent nylon, the face a lightweight ripstop with a water repellent treatment. Hardware is a two way zipper, a snug fit hood, a hem bungee, zippered pockets and reflective details, and the jacket stuffs into one of its own pockets. Nike sells it as style IO9003 in Black, Safety Orange and Old Royal, sizes XS to 4XL with tall sizes from S to 4XL, at 400 dollars. Scheels lists the Old Royal at 450 dollars and Flatspot in London has the Black at 370 pounds.

The down is ExpeDry, supplied by Allied Feather + Down in California, the same gold treated cluster Nike used in the Lava Loft. Nike's Behind the Design page calls it gold flecked, quick drying goose down. Allied's figure is that ExpeDry dries up to 50 percent faster than untreated down, a manufacturer's number rather than an independent lab's.

Lava Loft Weighed 10 Ounces at 700 Fill

Nike's newsroom release for the Lava Loft Down Jacket, dated November 6, 2025, listed 10 ounces for a men's medium and 700 fill ExpeDry Gold insulation. That jacket carried AeroLoft venting perforations from 0.7 millimeters to over 2 centimeters and went on sale January 1, 2026. Measured on Nike's own numbers for the same size, the Lava Flow Ultralight adds 300 fill power and drops 1.25 ounces.

Margaret Mussman, senior director of ACG apparel and accessories design at Nike, spent more than two years on the Lava Flow Ultralight, according to Baldwin's October 7, 2026 report from the Moab trip. Baldwin wrote that the group heard not just what changed but why: the zipper pulls got lighter, the down, the thread thickness. When he asked which designs she would go back and change, Mussman answered, "Oof. All of them."

Moab Ran From 107F to 37F Inside 48 Hours

Nike ACG called the trip All Conditions Gear Research Mission 01, nicknamed The Big Drop, and ran it over 48 hours near Moab with a crew of 35, per House of Heat's Ali Albaqshi on October 5, 2026. Baldwin counted 27 researchers on the Saturday hike, 12 miles with a 3 mile switchback and a 1,500 foot descent to camp, a rock reading 109F before the overnight dropped into the upper 40s. The two reports log different lows on the same weekend, 37F from House of Heat and the upper 40s from Baldwin.

The brand's own October 6, 2026 post on the desert heat test carried the caption Moab can clock in above 100F and clock out at 40F. Basecamp was a thermochromic Research Station that read white in the heat and turned orange as the air cooled, the crew worked with local guides Moab Landkeepers, and each participant went home with their own high and low written on their jacket. Baldwin slept in his on body heat alone, no extra layers, and disclosed that Nike paid for the trip.

Nike ACG Priced It One Dollar Over Mountain Hardwear

Gear Patrol's Jack Seemer, writing October 7, 2026, lined the Lava Flow Ultralight up against the Mountain Hardwear Ghost Whisperer Hoody at 399 dollars and the Patagonia Down Sweater Hoody at 345 dollars, and judged its warmth to weight comparable to the Ghost Whisperer. At 400 dollars Nike is asking one dollar more than the jacket the category measures itself against.

The numbered footage reads as a log entry, and ACG has written in that register all year. The brand ran its Aireez field test in July through four captions reading tested, deployed, worn and documented, and its Racing Department took five podiums at Chongli 168 on July 11 and 12, 2026 before releasing a recap film with no shoe in it. Thermodynamics testing footage 001 is the same voice applied to down: show the thermometer, hide the lookbook.

The Holiday 2026 campaign was shot in Hatcher Pass, Alaska under the line Molten warmth for biting cold, and Nike's Behind the Design page opens on a polar bear, fur that traps warm air without needing blubber. Two years of Mussman's work came out to 248 grams at 1,000 fill, and the designer's own verdict on the result was that she would change all of it.