The price gap between cotton and polyester is being repriced by crude oil. On September 9, the ICE December cotton contract settled at 87.28 cents per pound, up 1.11% in a single session, rebounding sharply from a three-week low of 85.56 cents the previous day. This rally was not driven by demand but by cost-side substitution—Brent crude breaking above $100 per barrel directly raised polyester production costs, restoring cotton's competitive edge in fiber substitution.
Cost Transmission: How Oil Lifts Cotton
The transmission path from crude to cotton is straightforward: higher oil prices push up PTA and MEG costs, which lift polyester staple and filament quotes, prompting spinners to reconsider their fiber blending ratios. When polyester prices approach or exceed cotton, buyers tend to increase cotton usage, providing support to cotton prices.
StoneX risk management consultant Bailey McHenry confirmed this logic: higher oil prices combined with cotton's prior decline have improved cotton's demand advantage over synthetic fibers. Meanwhile, the dollar index hovered near a two-week low, making dollar-denominated commodities cheaper for overseas buyers and further stimulating international purchasing interest.
This means the current support for cotton does not come from end-user consumption recovery but from the passive rise in substitute costs. For domestic spinners, the sustainability of this support depends on whether oil prices can remain elevated—once geopolitical tensions ease and crude retreats, cotton's comparative advantage could narrow quickly.
Supply Side: U.S. Quality Decline vs. Brazilian Bumper Crop
Supply-side signals are mixed. USDA's weekly crop progress report showed that as of September 6, the U.S. cotton good-to-excellent rating was only 34%, down from 39% the previous week and well below 54% a year ago. The harvest rate stood at 7%, matching last year and slightly above the five-year average of 6%.
The sharp decline in crop quality means the share of high-grade U.S. cotton may shrink, posing a potential cost pressure for high-count yarn producers. If the upcoming WASDE report further downgrades U.S. production or quality expectations, ICE cotton could gain additional upward momentum.
But the Southern Hemisphere tells a different story. Consultancy Agroconsult raised its 2025/26 Brazilian cotton output forecast by about 300,000 tons to a record 4.5 million tons, citing improved yields found in field surveys. Brazil's continued production growth is reshaping global cotton trade flows, creating substitution pressure on U.S. and Australian cotton.
Amid these crosscurrents, ICE deliverable No. 2 cotton inventory stood unchanged at 54,414 bales as of September 8, a neutral level that offers no clear directional signal.
Industry Impact: Transmission Lags Across Textile Clusters
For major Chinese textile hubs such as Keqiao, Shengze, and Nantong, the transmission from international cotton futures to domestic spot prices takes time. The Cotlook A Index rose just 10 points to 96.10 cents per pound on September 9, far less than the futures market, indicating that spot traders remain cautious.
This futures-strong, spot-weak pattern means two things for downstream factories: first, raw material procurement costs will not rise immediately, leaving buffer room for yarn quotes; second, if futures continue to climb, traders may hold back sales, gradually widening spot premiums.
For export-oriented spinners, the currency effect of a weaker dollar needs to be factored into pricing models. Dollar-denominated cotton is cheaper, but RMB exchange rate fluctuations could offset part of that advantage. Exporters should shorten quote validity periods or include raw material price adjustment clauses.