Arc’teryx’s Delta Jacket is an ultralight fleece made of Octa Fleece, one of the newer, high-tech fleeces to hit the market in the past couple of years. The name comes from the octopus-like weaving which creates air gaps, which help trap warmth while also allowing moisture to escape. It’s very popular with cottage industry ultralight brands, but Arc’teryx adopted it for the 2025 revamp of the company’s popular Delta fleece jacket.
I hesitated to put this jacket in this guide because, while I like it as…

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